From: Mike Christie <michael.christie@oracle.com>
To: subbu.seetharaman@broadcom.com, ketan.mukadam@broadcom.com,
jitendra.bhivare@broadcom.com, lduncan@suse.com,
cleech@redhat.com, njavali@marvell.com, mrangankar@marvell.com,
GR-QLogic-Storage-Upstream@marvell.com, varun@chelsio.com,
martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
james.bottomley@hansenpartnership.com
Subject: [PATCH 04/15] iscsi class: drop session lock in iscsi_session_chkready
Date: Tue, 1 Dec 2020 15:29:45 -0600 [thread overview]
Message-ID: <1606858196-5421-5-git-send-email-michael.christie@oracle.com> (raw)
In-Reply-To: <1606858196-5421-1-git-send-email-michael.christie@oracle.com>
The session lock in iscsi_session_chkready is not needed because when we
transition from logged into to another state we will blocked and/or
remove the devices under the session, so no new IO will be sent the
drivers after the block/remove. IO that races with the block/removal is
cleaned up by the drivers when it handles all outstanding IO, so this
just added an extra lock in the main IO path. This patch removes the
lock like other transport classes.
Signed-off-by: Mike Christie <michael.christie@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 2eb3e4f..e9ad04a 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);
--
1.8.3.1
next prev parent reply other threads:[~2020-12-01 21:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 21:29 [RFC PATCH 00/15] libiscsi: lock clean ups Mike Christie
2020-12-01 21:29 ` [PATCH 01/15] libiscsi: fix iscsi_prep_scsi_cmd_pdu error handling Mike Christie
2020-12-02 17:04 ` Lee Duncan
2020-12-01 21:29 ` [PATCH 02/15] libiscsi: drop taskqueuelock Mike Christie
2020-12-01 21:29 ` [PATCH 03/15] qla4xxx: use iscsi_is_session_online Mike Christie
2020-12-03 21:07 ` Lee Duncan
2020-12-01 21:29 ` Mike Christie [this message]
2020-12-03 21:08 ` [PATCH 04/15] iscsi class: drop session lock in iscsi_session_chkready Lee Duncan
2020-12-01 21:29 ` [PATCH 05/15] libiscsi: remove queued_cmdsn Mike Christie
2020-12-01 21:29 ` [PATCH 06/15] libiscsi: drop frwd lock for session state Mike Christie
2020-12-01 21:29 ` [PATCH 07/15] libiscsi: separate itt from task allocation Mike Christie
2020-12-01 21:29 ` [PATCH 08/15] iser, be2iscsi, qla4xxx: set scsi_host_template cmd_size Mike Christie
2020-12-01 21:29 ` [PATCH 09/15] bnx2i: " Mike Christie
2020-12-01 21:29 ` [PATCH 10/15] qedi: " Mike Christie
2020-12-01 21:29 ` [PATCH 11/15] iscsi_tcp, libcxgbi: " Mike Christie
2020-12-01 21:29 ` [PATCH 12/15] libiscsi: use blk/scsi-ml mq cmd pre-allocator Mike Christie
2020-12-01 21:29 ` [PATCH 13/15] libiscsi: drop back_lock requirement for iscsi_put_task Mike Christie
2020-12-01 21:29 ` [PATCH 14/15] libiscsi: drop back_lock from xmit path Mike Christie
2020-12-01 21:29 ` [PATCH 15/15] libiscsi: convert ping_task to refcount handler Mike Christie
2020-12-02 1:27 ` Mike Christie
2020-12-04 12:10 ` [EXT] [RFC PATCH 00/15] libiscsi: lock clean ups Manish Rangankar
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