kernel_optimize_test/drivers/s390
Julian Wiedmann a6c3d93963 s390/qeth: on channel error, reject further cmd requests
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>
2018-03-22 11:52:30 -04:00
..
block vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
char vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
cio s390/cio: fix kernel-doc usage 2018-02-05 07:34:52 +01:00
crypto treewide: Use DEVICE_ATTR_RO 2018-01-09 16:34:34 +01:00
net s390/qeth: on channel error, reject further cmd requests 2018-03-22 11:52:30 -04:00
scsi s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
virtio virtio/s390: implement PM operations for virtio_ccw 2018-02-14 14:34:09 +02:00
Makefile s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00