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    Subject[PATCH 5.10 076/157] scsi: pm80xx: Make running_req atomic
    Date
    From: Viswas G <Viswas.G@microchip.com>

    [ Upstream commit 4a2efd4b89fcaa6e9a7b4ce49a441afaacba00ea ]

    Incorrect value of the running_req was causing the driver unload to be
    stuck during the SAS lldd_dev_gone notification handling. During SATA I/O
    completion, for some error status values, the driver schedules the event
    handler and running_req is decremented from that. However, there are some
    other error status values (like IO_DS_IN_RECOVERY,
    IO_XFER_ERR_LAST_PIO_DATAIN_CRC_ERR) where the I/O has already been
    completed by fw/driver so running_req is not decremented.

    Also during NCQ error handling, driver itself will initiate READ_LOG_EXT
    and ABORT_ALL. When libsas/libata initiate READ_LOG_EXT (0x2F), driver
    increments running_req. This will be completed by the driver in
    pm80xx_chip_sata_req(), but running_req was not decremented.

    Link: https://lore.kernel.org/r/20201102165528.26510-3-Viswas.G@microchip.com.com
    Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
    Signed-off-by: Viswas G <Viswas.G@microchip.com>
    Signed-off-by: Ruksar Devadi <Ruksar.devadi@microchip.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/scsi/pm8001/pm8001_hwi.c | 58 +++++++++++++----
    drivers/scsi/pm8001/pm8001_init.c | 2 +-
    drivers/scsi/pm8001/pm8001_sas.c | 11 ++--
    drivers/scsi/pm8001/pm8001_sas.h | 2 +-
    drivers/scsi/pm8001/pm80xx_hwi.c | 101 +++++++++++++++++++++++++++---
    5 files changed, 147 insertions(+), 27 deletions(-)

    diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
    index 597d7a096a97..9e9a546da959 100644
    --- a/drivers/scsi/pm8001/pm8001_hwi.c
    +++ b/drivers/scsi/pm8001/pm8001_hwi.c
    @@ -1587,7 +1587,7 @@ void pm8001_work_fn(struct work_struct *work)
    ts->stat = SAS_QUEUE_FULL;
    pm8001_dev = ccb->device;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    spin_lock_irqsave(&t->task_state_lock, flags1);
    t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
    t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
    @@ -1942,7 +1942,7 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    sas_ssp_task_response(pm8001_ha->dev, t, iu);
    }
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_ABORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -1958,7 +1958,7 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_UNDERRUN;
    ts->residual = param;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2172,7 +2172,7 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2487,7 +2487,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    pm8001_printk("response to large\n"));
    }
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_ABORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2495,7 +2495,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    /* following cases are to do cases */
    case IO_UNDERFLOW:
    @@ -2506,19 +2506,23 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->stat = SAS_DATA_UNDERRUN;
    ts->residual = param;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_NO_DEVICE\n"));
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_PHY_DOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_BREAK\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_INTERRUPTED;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_PHY_NOT_READY:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2526,6 +2530,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_PROTOCOL_NOT_SUPPORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2534,6 +2540,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_EPROTO;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_ZONE_VIOLATION:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2541,6 +2549,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_UNKNOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2548,6 +2558,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_CONT0;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2587,6 +2599,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_CONN_RATE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2610,48 +2624,64 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_WRONG_DEST;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_NAK_RECEIVED:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_NAK_RECEIVED\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_NAK_R_ERR;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_ACK_NAK_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_ACK_NAK_TIMEOUT\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_NAK_R_ERR;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_DMA:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_DMA\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_SATA_LINK_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_SATA_LINK_TIMEOUT\n"));
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_REJECTED_NCQ_MODE:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_REJECTED_NCQ_MODE\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DATA_UNDERRUN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_OPEN_RETRY_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_OPEN_RETRY_TIMEOUT\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_TO;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_PORT_IN_RESET:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_PORT_IN_RESET\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_DS_NON_OPERATIONAL:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2672,6 +2702,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    pm8001_printk(" IO_DS_IN_RECOVERY\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_DS_IN_ERROR:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2693,6 +2725,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    default:
    PM8001_DEVIO_DBG(pm8001_ha,
    @@ -2700,6 +2734,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    /* not allowed case. Therefore, return failed status */
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    }
    spin_lock_irqsave(&t->task_state_lock, flags);
    @@ -2776,7 +2812,7 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2976,7 +3012,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAM_STAT_GOOD;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_ABORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2984,7 +3020,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OVERFLOW:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk("IO_UNDERFLOW\n"));
    @@ -2992,7 +3028,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk("IO_NO_DEVICE\n"));
    diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
    index 2025361b36e9..89397e5351ff 100644
    --- a/drivers/scsi/pm8001/pm8001_init.c
    +++ b/drivers/scsi/pm8001/pm8001_init.c
    @@ -412,7 +412,7 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
    pm8001_ha->devices[i].dev_type = SAS_PHY_UNUSED;
    pm8001_ha->devices[i].id = i;
    pm8001_ha->devices[i].device_id = PM8001_MAX_DEVICES;
    - pm8001_ha->devices[i].running_req = 0;
    + atomic_set(&pm8001_ha->devices[i].running_req, 0);
    }
    pm8001_ha->flags = PM8001F_INIT_TIME;
    /* Initialize tags */
    diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
    index 9889bab7d31c..d6e0bc588698 100644
    --- a/drivers/scsi/pm8001/pm8001_sas.c
    +++ b/drivers/scsi/pm8001/pm8001_sas.c
    @@ -456,9 +456,11 @@ static int pm8001_task_exec(struct sas_task *task,
    ccb->device = pm8001_dev;
    switch (task_proto) {
    case SAS_PROTOCOL_SMP:
    + atomic_inc(&pm8001_dev->running_req);
    rc = pm8001_task_prep_smp(pm8001_ha, ccb);
    break;
    case SAS_PROTOCOL_SSP:
    + atomic_inc(&pm8001_dev->running_req);
    if (is_tmf)
    rc = pm8001_task_prep_ssp_tm(pm8001_ha,
    ccb, tmf);
    @@ -467,6 +469,7 @@ static int pm8001_task_exec(struct sas_task *task,
    break;
    case SAS_PROTOCOL_SATA:
    case SAS_PROTOCOL_STP:
    + atomic_inc(&pm8001_dev->running_req);
    rc = pm8001_task_prep_ata(pm8001_ha, ccb);
    break;
    default:
    @@ -479,13 +482,13 @@ static int pm8001_task_exec(struct sas_task *task,
    if (rc) {
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("rc is %x\n", rc));
    + atomic_dec(&pm8001_dev->running_req);
    goto err_out_tag;
    }
    /* TODO: select normal or high priority */
    spin_lock(&t->task_state_lock);
    t->task_state_flags |= SAS_TASK_AT_INITIATOR;
    spin_unlock(&t->task_state_lock);
    - pm8001_dev->running_req++;
    } while (0);
    rc = 0;
    goto out_done;
    @@ -886,11 +889,11 @@ static void pm8001_dev_gone_notify(struct domain_device *dev)
    PM8001_DISC_DBG(pm8001_ha,
    pm8001_printk("found dev[%d:%x] is gone.\n",
    pm8001_dev->device_id, pm8001_dev->dev_type));
    - if (pm8001_dev->running_req) {
    + if (atomic_read(&pm8001_dev->running_req)) {
    spin_unlock_irqrestore(&pm8001_ha->lock, flags);
    pm8001_exec_internal_task_abort(pm8001_ha, pm8001_dev ,
    dev, 1, 0);
    - while (pm8001_dev->running_req)
    + while (atomic_read(&pm8001_dev->running_req))
    msleep(20);
    spin_lock_irqsave(&pm8001_ha->lock, flags);
    }
    @@ -968,7 +971,7 @@ void pm8001_open_reject_retry(
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    spin_lock_irqsave(&task->task_state_lock, flags1);
    task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
    task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
    diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
    index 95663e138083..091574721ea1 100644
    --- a/drivers/scsi/pm8001/pm8001_sas.h
    +++ b/drivers/scsi/pm8001/pm8001_sas.h
    @@ -293,7 +293,7 @@ struct pm8001_device {
    struct completion *dcompletion;
    struct completion *setds_completion;
    u32 device_id;
    - u32 running_req;
    + atomic_t running_req;
    };

    struct pm8001_prd_imt {
    diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
    index c9a89e980e1c..59053c61908e 100644
    --- a/drivers/scsi/pm8001/pm80xx_hwi.c
    +++ b/drivers/scsi/pm8001/pm80xx_hwi.c
    @@ -1960,13 +1960,15 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    sas_ssp_task_response(pm8001_ha->dev, t, iu);
    }
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_ABORTED:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_ABORTED IOMB Tag\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_UNDERFLOW:
    /* SSP Completion with error */
    @@ -1977,13 +1979,15 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_UNDERRUN;
    ts->residual = param;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_NO_DEVICE\n"));
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_PHY_DOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -1992,6 +1996,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_OPEN_REJECT;
    /* Force the midlayer to retry */
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_PHY_NOT_READY:
    PM8001_IO_DBG(pm8001_ha,
    @@ -1999,6 +2005,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_INVALID_SSP_RSP_FRAME:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2006,6 +2014,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_PROTOCOL_NOT_SUPPORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2013,6 +2023,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_EPROTO;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_ZONE_VIOLATION:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2020,6 +2032,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_UNKNOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2027,6 +2041,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS:
    case IO_XFER_OPEN_RETRY_BACKOFF_THRESHOLD_REACHED:
    @@ -2050,6 +2066,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_BAD_DEST;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_CONNECTION_RATE_NOT_SUPPORTED:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk(
    @@ -2057,6 +2075,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_CONN_RATE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_WRONG_DESTINATION:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2064,6 +2084,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_WRONG_DEST;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_NAK_RECEIVED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2071,18 +2093,24 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_ACK_NAK_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_ACK_NAK_TIMEOUT\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_NAK_R_ERR;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_DMA:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_DMA\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_OPEN_RETRY_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2090,18 +2118,24 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_OFFSET_MISMATCH:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_OFFSET_MISMATCH\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_PORT_IN_RESET:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_PORT_IN_RESET\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_DS_NON_OPERATIONAL:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2118,18 +2152,24 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    pm8001_printk("IO_DS_IN_RECOVERY\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_TM_TAG_NOT_FOUND:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_TM_TAG_NOT_FOUND\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_SSP_EXT_IU_ZERO_LEN_ERROR:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_SSP_EXT_IU_ZERO_LEN_ERROR\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_HW_RESOURCE_BUSY:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2137,6 +2177,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    default:
    PM8001_DEVIO_DBG(pm8001_ha,
    @@ -2144,6 +2186,8 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha , void *piomb)
    /* not allowed case. Therefore, return failed status */
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    }
    PM8001_IO_DBG(pm8001_ha,
    @@ -2203,7 +2247,7 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2528,7 +2572,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    pm8001_printk("response too large\n"));
    }
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_ABORTED:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2536,7 +2580,7 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    /* following cases are to do cases */
    case IO_UNDERFLOW:
    @@ -2547,19 +2591,23 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->stat = SAS_DATA_UNDERRUN;
    ts->residual = param;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_NO_DEVICE\n"));
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_PHY_DOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_BREAK\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_INTERRUPTED;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_PHY_NOT_READY:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2567,6 +2615,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_PROTOCOL_NOT_SUPPORTED:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk(
    @@ -2574,6 +2624,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_EPROTO;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_ZONE_VIOLATION:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2581,6 +2633,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_UNKNOWN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2588,6 +2642,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_CONT0;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_IT_NEXUS_LOSS:
    case IO_XFER_OPEN_RETRY_BACKOFF_THRESHOLD_REACHED:
    @@ -2631,6 +2687,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_CONN_RATE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OPEN_CNX_ERROR_STP_RESOURCES_BUSY:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk(
    @@ -2653,48 +2711,64 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_WRONG_DEST;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_NAK_RECEIVED:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_NAK_RECEIVED\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_NAK_R_ERR;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_ACK_NAK_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_ACK_NAK_TIMEOUT\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_NAK_R_ERR;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_DMA:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_DMA\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_SATA_LINK_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_SATA_LINK_TIMEOUT\n"));
    ts->resp = SAS_TASK_UNDELIVERED;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_REJECTED_NCQ_MODE:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_ERROR_REJECTED_NCQ_MODE\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DATA_UNDERRUN;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_OPEN_RETRY_TIMEOUT:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_XFER_OPEN_RETRY_TIMEOUT\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_TO;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_PORT_IN_RESET:
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("IO_PORT_IN_RESET\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_DS_NON_OPERATIONAL:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2715,6 +2789,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    pm8001_printk("IO_DS_IN_RECOVERY\n"));
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_DS_IN_ERROR:
    PM8001_IO_DBG(pm8001_ha,
    @@ -2736,6 +2812,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_OPEN_REJECT;
    ts->open_rej_reason = SAS_OREJ_RSVD_RETRY;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    default:
    PM8001_DEVIO_DBG(pm8001_ha,
    @@ -2743,6 +2821,8 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    /* not allowed case. Therefore, return failed status */
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_DEV_NO_RESPONSE;
    + if (pm8001_dev)
    + atomic_dec(&pm8001_dev->running_req);
    break;
    }
    spin_lock_irqsave(&t->task_state_lock, flags);
    @@ -2820,7 +2900,7 @@ static void mpi_sata_event(struct pm8001_hba_info *pm8001_ha , void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_XFER_ERROR_BREAK:
    PM8001_IO_DBG(pm8001_ha,
    @@ -3040,7 +3120,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAM_STAT_GOOD;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    if (pm8001_ha->smp_exp_mode == SMP_DIRECT) {
    PM8001_IO_DBG(pm8001_ha,
    pm8001_printk("DIRECT RESPONSE Length:%d\n",
    @@ -3063,7 +3143,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->resp = SAS_TASK_COMPLETE;
    ts->stat = SAS_ABORTED_TASK;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_OVERFLOW:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk("IO_UNDERFLOW\n"));
    @@ -3071,7 +3151,7 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
    ts->stat = SAS_DATA_OVERRUN;
    ts->residual = 0;
    if (pm8001_dev)
    - pm8001_dev->running_req--;
    + atomic_dec(&pm8001_dev->running_req);
    break;
    case IO_NO_DEVICE:
    PM8001_IO_DBG(pm8001_ha, pm8001_printk("IO_NO_DEVICE\n"));
    @@ -4809,6 +4889,7 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
    flags);
    pm8001_ccb_task_free_done(pm8001_ha, task,
    ccb, tag);
    + atomic_dec(&pm8001_ha_dev->running_req);
    return 0;
    }
    }
    --
    2.30.1


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