Jason Wang 476e8ba712 vhost_net: switch to use mutex_trylock() in vhost_net_busy_poll() ... We used to hold the mutex of paired virtqueue in vhost_net_busy_poll(). But this will results an inconsistent lock order which may cause deadlock if we try to bring back the protection of device IOTLB with vq mutex that requires to hold mutex of all virtqueues at the same time. Fix this simply by switching to use mutex_trylock(), when fail just skip the busy polling. This can happen when device IOTLB is under updating which should be rare. Fixes: commit 78139c94dc ("net: vhost: lock the vqs one by one") Cc: Tonghao Zhang <xiangxia.m.yue@gmail.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2018-12-12 21:56:19 -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	vhost_net: switch to use mutex_trylock() in vhost_net_busy_poll()	2018-12-12 21:56:19 -08:00
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: make sure used idx is seen before log in vhost_add_used_n()	2018-12-12 21:56:19 -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	vhost/vsock: fix use-after-free in network stack callers	2018-12-06 14:28:38 -05:00