From d39bfd0686fd2b21f857c61bb2753db3a932cb24 Mon Sep 17 00:00:00 2001
From: Mike Christie <michael.christie@oracle.com>
Date: Sat, 6 Feb 2021 22:46:08 -0600
Subject: [PATCH] scsi: iscsi: Drop session lock in iscsi_session_chkready()
The session lock in iscsi_session_chkready() is not needed because when we
transition from logged into to another state we will block and/or remove
the devices under the session, so no new I/O will be sent to the drivers
after the block/remove. I/O that races with the block/removal is cleaned up
by the drivers when it handles all outstanding I/O, so this just added an
extra lock in the main I/O path. This patch removes the lock like other
transport classes.
Link: https://lore.kernel.org/r/20210207044608.27585-10-michael.christie@oracle.com
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>
---
drivers/scsi/scsi_transport_iscsi.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 2e68c0a87698..969d24d580e2 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1701,10 +1701,8 @@ static const char *iscsi_session_state_name(int state)
int iscsi_session_chkready(struct iscsi_cls_session *session)
{
- unsigned long flags;
int err;
- spin_lock_irqsave(&session->lock, flags);
switch (session->state) {
case ISCSI_SESSION_LOGGED_IN:
err = 0;
@@ -1719,7 +1717,6 @@ int iscsi_session_chkready(struct iscsi_cls_session *session)
err = DID_NO_CONNECT << 16;
break;
}
- spin_unlock_irqrestore(&session->lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(iscsi_session_chkready);