scsi: qla2xxx: check UNLOADING before posting async work

commit 5a263892d7d0b4fe351363f8d1a14c6a75955475 upstream.

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: 45235022da99 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 4a89202115521e3b3faa172aea078267f2d52392..98908c2a096a713ccef1f6ee9a71ced5e46277cb 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4854,6 +4854,9 @@ 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;