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SubjectRe: [PATCH 09/13] ibmvfc: implement channel enquiry and setup commands
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On 11/27/20 9:49 AM, Brian King wrote:
> On 11/25/20 7:48 PM, Tyrel Datwyler wrote:
>> --- a/drivers/scsi/ibmvscsi/ibmvfc.c
>> +++ b/drivers/scsi/ibmvscsi/ibmvfc.c
>
>> @@ -4462,6 +4464,118 @@ static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
>> ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
>> }
>>
>> +static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
>> +{
>> + struct ibmvfc_host *vhost = evt->vhost;
>> + u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
>> + int level = IBMVFC_DEFAULT_LOG_LEVEL;
>> +
>> + ibmvfc_free_event(evt);
>> +
>> + switch (mad_status) {
>> + case IBMVFC_MAD_SUCCESS:
>> + ibmvfc_dbg(vhost, "Channel Setup succeded\n");
>> + vhost->do_enquiry = 0;
>> + break;
>> + case IBMVFC_MAD_FAILED:
>> + level += ibmvfc_retry_host_init(vhost);
>> + ibmvfc_log(vhost, level, "Channel Setup failed\n");
>> + fallthrough;
>> + case IBMVFC_MAD_DRIVER_FAILED:
>> + return;
>> + default:
>> + dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
>> + mad_status);
>> + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
>> + return;
>> + }
>> +
>> + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
>> + wake_up(&vhost->work_wait_q);
>> +}
>> +
>> +static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
>> +{
>> + struct ibmvfc_channel_setup_mad *mad;
>> + struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
>> + struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
>> +
>> + memset(setup_buf, 0, sizeof(*setup_buf));
>> + setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
>> +
>> + ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
>> + mad = &evt->iu.channel_setup;
>> + memset(mad, 0, sizeof(*mad));
>> + mad->common.version = cpu_to_be32(1);
>> + mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
>> + mad->common.length = cpu_to_be16(sizeof(*mad));
>> + mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
>> + mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
>> +
>> + ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
>> +
>> + if (!ibmvfc_send_event(evt, vhost, default_timeout))
>> + ibmvfc_dbg(vhost, "Sent channel setup\n");
>> + else
>> + ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
>> +}
>> +
>> +static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
>> +{
>> + struct ibmvfc_host *vhost = evt->vhost;
>> + struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
>> + u32 mad_status = be16_to_cpu(rsp->common.status);
>> + int level = IBMVFC_DEFAULT_LOG_LEVEL;
>> +
>> + switch (mad_status) {
>> + case IBMVFC_MAD_SUCCESS:
>> + ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
>> + vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
>
> You need a ibmvfc_free_event(evt) here so you don't leak events.
>

Indeed

>> + break;
>> + case IBMVFC_MAD_FAILED:
>> + level += ibmvfc_retry_host_init(vhost);
>> + ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
>> + ibmvfc_free_event(evt);
>
> Looks like you are freeing this event twice due to the fallthrough...

Good catch

>
>> + fallthrough;
>> + case IBMVFC_MAD_DRIVER_FAILED:
>> + ibmvfc_free_event(evt);
>> + return;
>> + default:
>> + dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
>> + mad_status);
>> + ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
>> + ibmvfc_free_event(evt);
>> + return;
>> + }
>> +
>> + ibmvfc_channel_setup(vhost);
>> +}
>> +
>
>
>

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