[0/2] fix dead lock issues in vhost_vdpa

Message

Zhu, Lingshan Sept. 7, 2020, 10:52 a.m. UTC

This series fixed a dead lock issue in vhost_vdpa.
In current vhost_vdpa ioctl code path, it will lock
vhost_dev mutex once, then try to re-lock it in
vhost_set_backend_features, which is buggy.

These commits will remove mutex locks operations
in vhost_set_backend_features, then as a compensation,
a new function vhost_net_set_backend_features() in vhost_net
is introduced to do proper mutex locking and call
vhost_set_backend_features()

Please help review. Thanks!

Zhu Lingshan (2):
  vhost: remove mutex ops in vhost_set_backend_features
  vhost_net: introduce vhost_net_set_backend_features()

 drivers/vhost/net.c   | 9 ++++++++-
 drivers/vhost/vhost.c | 2 --
 2 files changed, 8 insertions(+), 3 deletions(-)