This is a note to let you know that I've just added the patch titled
scsi_transport_srp: Fix a race condition
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi_transport_srp-fix-a-race-condition.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 535fb906225fb7436cb658144d0c0cea14a26f3e Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Date: Mon, 18 May 2015 13:22:44 +0200
Subject: scsi_transport_srp: Fix a race condition
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
commit 535fb906225fb7436cb658144d0c0cea14a26f3e upstream.
Avoid that srp_terminate_io() can get invoked while srp_queuecommand()
is in progress. This patch avoids that an I/O timeout can trigger the
following kernel warning:
WARNING: at drivers/infiniband/ulp/srp/ib_srp.c:1447 srp_terminate_io+0xef/0x100 [ib_srp]()
Call Trace:
[<ffffffff814c65a2>] dump_stack+0x4e/0x68
[<ffffffff81051f71>] warn_slowpath_common+0x81/0xa0
[<ffffffff8105204a>] warn_slowpath_null+0x1a/0x20
[<ffffffffa075f51f>] srp_terminate_io+0xef/0x100 [ib_srp]
[<ffffffffa07495da>] __rport_fail_io_fast+0xba/0xc0 [scsi_transport_srp]
[<ffffffffa0749a90>] rport_fast_io_fail_timedout+0xe0/0xf0 [scsi_transport_srp]
[<ffffffff8106e09b>] process_one_work+0x1db/0x780
[<ffffffff8106e75b>] worker_thread+0x11b/0x450
[<ffffffff81073c64>] kthread+0xe4/0x100
[<ffffffff814cf26c>] ret_from_fork+0x7c/0xb0
See also patch "scsi_transport_srp: Add transport layer error
handling" (commit ID 29c17324803c).
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: James Bottomley <JBottomley@xxxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: Sebastian Parschauer <sebastian.riemer@xxxxxxxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/scsi_transport_srp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -439,8 +439,10 @@ static void __rport_fail_io_fast(struct
/* Involve the LLD if possible to terminate all I/O on the rport. */
i = to_srp_internal(shost->transportt);
- if (i->f->terminate_rport_io)
+ if (i->f->terminate_rport_io) {
+ srp_wait_for_queuecommand(shost);
i->f->terminate_rport_io(rport);
+ }
}
/**
Patches currently in stable-queue which might be from bart.vanassche@xxxxxxxxxxx are
queue-4.0/ib-srp-fix-a-connection-setup-race.patch
queue-4.0/scsi_transport_srp-introduce-srp_wait_for_queuecommand.patch
queue-4.0/ib-srp-fix-connection-state-tracking.patch
queue-4.0/ib-srp-fix-reconnection-failure-handling.patch
queue-4.0/scsi_transport_srp-fix-a-race-condition.patch
queue-4.0/ib-srp-remove-an-extraneous-scsi_host_put-from-an-error-path.patch
--
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