tree dc985f3c861d9490a1b5ffe82583497b6fe64236
parent 171901d15deeef61aa8e1b0d0772404f39691b73
author Thomas Hellstrom <thellstrom@vmware.com> 1235988656 +0100
committer Dave Airlie <airlied@linux.ie> 1236037820 +1000

drm: Avoid client deadlocks when the master disappears.

This is done by
1) Wake up lock waiters when we close the master file descriptor.
   Not when the master structure is removed, since the latter
   requires the waiters themselves to release the refcount on the
   master structure -> Deadlock.
2) Send a SIGTERM to all clients waiting for the lock.
   Normally these clients will get a SIGPIPE when the X server dies,
   but clients may also spin trying to grab the DRM lock, without
   getting any sort of notification.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>