* Patch "s390/dasd: fix hanging device after clear subchannel" has been added to the 4.7-stable tree
@ 2016-09-05 13:55 gregkh
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From: gregkh @ 2016-09-05 13:55 UTC (permalink / raw)
To: sth, gregkh, schwidefsky, sebott; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
s390/dasd: fix hanging device after clear subchannel
to the 4.7-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:
s390-dasd-fix-hanging-device-after-clear-subchannel.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 9ba333dc55cbb9523553df973adb3024d223e905 Mon Sep 17 00:00:00 2001
From: Stefan Haberland <sth@linux.vnet.ibm.com>
Date: Mon, 8 Aug 2016 14:08:17 +0200
Subject: s390/dasd: fix hanging device after clear subchannel
From: Stefan Haberland <sth@linux.vnet.ibm.com>
commit 9ba333dc55cbb9523553df973adb3024d223e905 upstream.
When a device is in a status where CIO has killed all I/O by itself the
interrupt for a clear request may not contain an irb to determine the
clear function. Instead it contains an error pointer -EIO.
This was ignored by the DASD int_handler leading to a hanging device
waiting for a clear interrupt.
Handle -EIO error pointer correctly for requests that are clear pending and
treat the clear as successful.
Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/s390/block/dasd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1643,9 +1643,18 @@ void dasd_int_handler(struct ccw_device
u8 *sense = NULL;
int expires;
+ cqr = (struct dasd_ccw_req *) intparm;
if (IS_ERR(irb)) {
switch (PTR_ERR(irb)) {
case -EIO:
+ if (cqr && cqr->status == DASD_CQR_CLEAR_PENDING) {
+ device = (struct dasd_device *) cqr->startdev;
+ cqr->status = DASD_CQR_CLEARED;
+ dasd_device_clear_timer(device);
+ wake_up(&dasd_flush_wq);
+ dasd_schedule_device_bh(device);
+ return;
+ }
break;
case -ETIMEDOUT:
DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s: "
@@ -1661,7 +1670,6 @@ void dasd_int_handler(struct ccw_device
}
now = get_tod_clock();
- cqr = (struct dasd_ccw_req *) intparm;
/* check for conditions that should be handled immediately */
if (!cqr ||
!(scsw_dstat(&irb->scsw) == (DEV_STAT_CHN_END | DEV_STAT_DEV_END) &&
Patches currently in stable-queue which might be from sth@linux.vnet.ibm.com are
queue-4.7/s390-dasd-fix-hanging-device-after-clear-subchannel.patch
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2016-09-05 13:55 Patch "s390/dasd: fix hanging device after clear subchannel" has been added to the 4.7-stable tree gregkh
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