This is a note to let you know that I've just added the patch titled
scsi: only re-lock door after EH on devices that were reset
to the 3.17-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-only-re-lock-door-after-eh-on-devices-that-were-reset.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 48379270fe6808cf4612ee094adc8da2b7a83baa Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 3 Nov 2014 19:36:40 +0100
Subject: scsi: only re-lock door after EH on devices that were reset
From: Christoph Hellwig <hch@xxxxxx>
commit 48379270fe6808cf4612ee094adc8da2b7a83baa upstream.
Setups that use the blk-mq I/O path can lock up if a host with a single
device that has its door locked enters EH. Make sure to only send the
command to re-lock the door to devices that actually were reset and thus
might have lost their state. Otherwise the EH code might be get blocked
on blk_get_request as all requests for non-reset devices might be in use.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reported-by: Meelis Roos <meelis.roos@xxxxx>
Tested-by: Meelis Roos <meelis.roos@xxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/scsi_error.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1998,8 +1998,10 @@ static void scsi_restart_operations(stru
* is no point trying to lock the door of an off-line device.
*/
shost_for_each_device(sdev, shost) {
- if (scsi_device_online(sdev) && sdev->locked)
+ if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) {
scsi_eh_lock_door(sdev);
+ sdev->was_reset = 0;
+ }
}
/*
Patches currently in stable-queue which might be from hch@xxxxxx are
queue-3.17/scsi-only-re-lock-door-after-eh-on-devices-that-were-reset.patch
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