Messages in this thread Patch in this message |  | | From | Calvin Owens <> | Subject | [PATCH 4/6] Add refcount to fw_event_work struct | Date | Mon, 8 Jun 2015 20:50:54 -0700 |
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The fw_event_work struct is concurrently referenced at shutdown, so add a refcount to protect it.
Signed-off-by: Calvin Owens <calvinowens@fb.com> --- drivers/scsi/mpt2sas/mpt2sas_scsih.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c index 9645055..611b34d 100644 --- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c +++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c @@ -176,9 +176,37 @@ struct fw_event_work { u8 VP_ID; u8 ignore; u16 event; + struct kref refcount; char event_data[0] __aligned(4); }; +static void fw_event_work_free(struct kref *r) +{ + kfree(container_of(r, struct fw_event_work, refcount)); +} + +static void fw_event_work_get(struct fw_event_work *fw_work) +{ + kref_get(&fw_work->refcount); +} + +static void fw_event_work_put(struct fw_event_work *fw_work) +{ + kref_put(&fw_work->refcount, fw_event_work_free); +} + +static struct fw_event_work *alloc_fw_event_work(int len) +{ + struct fw_event_work *fw_event; + + fw_event = kzalloc(sizeof(*fw_event) + len, GFP_ATOMIC); + if (!fw_event) + return NULL; + + kref_init(&fw_event->refcount); + return fw_event; +} + /* raid transport support */ static struct raid_template *mpt2sas_raid_template; -- 1.8.1
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