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[v2,16/28] scsi: iscsi: Flush block work before unblock

Message ID 20210525181821.7617-17-michael.christie@oracle.com
State New
Headers show
Series [v2,01/28] scsi: iscsi: Add task completion helper | expand

Commit Message

Mike Christie May 25, 2021, 6:18 p.m. UTC 
We set the max_active iSCSI EH works to 1, so all work is going to execute
in order by default. However, userspace can now override this in sysfs. If
max_active > 1, we can end up with the block_work on CPU1 and
iscsi_unblock_session running the unblock_work on CPU2 and the session
and target/device state will end up out of sync with each other.

This adds a flush of the block_work in iscsi_unblock_session.

Fixes: 1d726aa6ef57 ("scsi: iscsi: Optimize work queue flush use")
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/scsi_transport_iscsi.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 909134b9c313..b07105ae7c91 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1969,6 +1969,8 @@  static void __iscsi_unblock_session(struct work_struct *work)
  */
 void iscsi_unblock_session(struct iscsi_cls_session *session)
 {
+	flush_work(&session->block_work);
+
 	queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 	/*
 	 * Blocking the session can be done from any context so we only