From: Mike Christie michael.christie@oracle.com
stable inclusion from stable-5.10.50 commit 68f2f83f6fb6d95f88298d53bbcaff3faac7fdaa bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 7ce9fc5ecde0d8bd64c29baee6c5e3ce7074ec9a ]
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.
Link: https://lore.kernel.org/r/20210525181821.7617-17-michael.christie@oracle.com 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 Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/scsi/scsi_transport_iscsi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c index 505c06f306df..2735178f15c7 100644 --- a/drivers/scsi/scsi_transport_iscsi.c +++ b/drivers/scsi/scsi_transport_iscsi.c @@ -1979,6 +1979,8 @@ 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