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scsi: qla2xxx: check UNLOADING before posting async work

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qlt_free_session_done() tries to post async PRLO / LOGO, and waits for the
completion of these async commands. If UNLOADING is set, this is doomed to
timeout, because the async logout command will never complete.

The only way to avoid waiting pointlessly is to fail posting these commands
in the first place if the driver is in UNLOADING state.  In general,
posting any command should be avoided when the driver is UNLOADING.

With this patch, "rmmod qla2xxx" completes without noticeable delay.

Link: https://lore.kernel.org/r/20200421204621.19228-3-mwilck@suse.com
Fixes: 45235022da ("scsi: qla2xxx: Fix driver unload by shutting down chip")
Acked-by: Arun Easi <aeasi@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Martin Wilck 2020-04-21 22:46:21 +02:00 committed by Martin K. Petersen
parent 856e152a3c
commit 5a263892d7
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/qla2xxx/qla_os.c
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@ -4862,6 +4862,9 @@ qla2x00_alloc_work(struct scsi_qla_host *vha, enum qla_work_type type)
struct qla_work_evt *e;
uint8_t bail;
if (test_bit(UNLOADING, &vha->dpc_flags))
return NULL;
QLA_VHA_MARK_BUSY(vha, bail);
if (bail)
return NULL;