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linux/drivers/s390
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Julian Wiedmann bba757a2c1 s390/qeth: on channel error, reject further cmd requests 
[ Upstream commit a6c3d93963 ]

When the IRQ handler determines that one of the cmd IO channels has
failed and schedules recovery, block any further cmd requests from
being submitted. The request would inevitably stall, and prevent the
recovery from making progress until the request times out.

This sort of error was observed after Live Guest Relocation, where
the pending IO on the READ channel intentionally gets terminated to
kick-start recovery. Simultaneously the guest executed SIOCETHTOOL,
triggering qeth to issue a QUERY CARD INFO command. The command
then stalled in the inoperabel WRITE channel.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-03-31 18:10:43 +02:00
..
block s390/dasd: fix wrongly assigned configuration data 2018-03-03 10:24:32 +01:00
char License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cio s390: vfio-ccw: Do not attempt to free no-op, test and tic cda. 2017-12-10 13:40:38 +01:00
crypto s390/zcrypt: Fix wrong comparison leading to strange load balancing 2018-02-03 17:38:59 +01:00
net s390/qeth: on channel error, reject further cmd requests 2018-03-31 18:10:43 +02:00
scsi License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
virtio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-05-16 09:24:44 -07:00
Makefile virtio/s390: rename drivers/s390/kvm -> drivers/s390/virtio 2015-07-07 14:27:06 +03:00