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scsi: iscsi: Fix recovery and unblocking race

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If the user sets the iscsi_eh_timer_workq/iscsi_eh workqueue's max_active
to greater than 1, the recovery_work could be running when
__iscsi_unblock_session() runs. The cancel_delayed_work() will then not
wait for the running work and we can race where we end up with the wrong
session state and scsi_device state set.

This replaces the cancel_delayed_work() with the sync version.

Link: https://lore.kernel.org/r/20220226230435.38733-2-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2022-02-26 17:04:30 -06:00 • committed by Martin K. Petersen
parent 07e0984b96
commit 8dd3dff3bf
1 changed files with 2 additions and 5 deletions
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7
drivers/scsi/scsi_transport_iscsi.c
View file

@ -1917,11 +1917,8 @@ static void __iscsi_unblock_session(struct work_struct *work)
unsigned long flags;
ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
/*
* The recovery and unblock work get run from the same workqueue,
* so try to cancel it if it was going to run after this unblock.
*/
cancel_delayed_work(&session->recovery_work);
cancel_delayed_work_sync(&session->recovery_work);
spin_lock_irqsave(&session->lock, flags);
session->state = ISCSI_SESSION_LOGGED_IN;
spin_unlock_irqrestore(&session->lock, flags);