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| author | Jason Wang <jasowang@redhat.com> | 2018-01-23 17:27:25 +0800 |
|---|---|---|
| committer | Alistair Strachan <astrachan@google.com> | 2019-01-15 17:08:37 -0800 |
| commit | b2696b4a37bdb9f2716017859a88b95ca6e30088 (patch) | |
| tree | 5e7265a5a985b06735e56151a81ea51ddd209e64 /include/linux/debugobjects.h | |
| parent | b53fc49147e25e6a6f672b319f3091c53f024f10 (diff) | |
UPSTREAM: vhost: use mutex_lock_nested() in vhost_dev_lock_vqs()
commit e9cb4239134c860e5f92c75bf5321bd377bb505b upstream.
We used to call mutex_lock() in vhost_dev_lock_vqs() which tries to
hold mutexes of all virtqueues. This may confuse lockdep to report a
possible deadlock because of trying to hold locks belong to same
class. Switch to use mutex_lock_nested() to avoid false positive.
Fixes: 6b1e6cc7855b0 ("vhost: new device IOTLB API")
Reported-by: syzbot+dbb7c1161485e61b0241@syzkaller.appspotmail.com
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit bd3ccdc6f922c6b7db4b7075d1b6596ddb986a98)
Bug: 121166534
Test: Ran cuttlefish with android-4.4 + VSOCKETS, VMWARE_VMCI_VSOCKETS
Signed-off-by: Alistair Strachan <astrachan@google.com>
Change-Id: I20829e721706c10ef1696de0d78dd99110e40a6b
Diffstat (limited to 'include/linux/debugobjects.h')
0 files changed, 0 insertions, 0 deletions