Jean-Philippe Brucker e3f787189e vhost: fix IOTLB locking ...

Commit 78139c94dc ("net: vhost: lock the vqs one by one") moved the vq
lock to improve scalability, but introduced a possible deadlock in
vhost-iotlb. vhost_iotlb_notify_vq() now takes vq->mutex while holding
the device's IOTLB spinlock. And on the vhost_iotlb_miss() path, the
spinlock is taken while holding vq->mutex.

Since calling vhost_poll_queue() doesn't require any lock, avoid the
deadlock by not taking vq->mutex.

Fixes: 78139c94dc ("net: vhost: lock the vqs one by one")
Acked-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2018-12-03 15:52:30 -08:00

..

Kconfig

vhost: allow vhost-scsi driver to be built-in

2018-08-22 01:01:32 +03:00

Kconfig.vringh

vhost: split out vringh Kconfig

2016-08-02 16:54:28 +03:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

net.c

net: vhost: remove bad code line

2018-10-07 21:31:32 -07:00

scsi.c

vhost/scsi: Use common handling code in request queue handler

2018-10-24 21:16:13 -04:00

test.c

treewide: kmalloc() -> kmalloc_array()

2018-06-12 16:19:22 -07:00

test.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

vhost.c

vhost: fix IOTLB locking

2018-12-03 15:52:30 -08:00

vhost.h

vhost: switch to use new message format

2018-08-06 10:41:04 -07:00

vringh.c

treewide: kmalloc() -> kmalloc_array()

2018-06-12 16:19:22 -07:00

vsock.c

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2018-04-06 19:21:41 -07:00