tree ed2dcd8f88f3be4df90fd1333f3735218e1be21a
parent 3945e47543863385b54d94c94b023ee7ca9df972
author Francisco Jerez <currojerez@riseup.net> 1287366873 +0200
committer Ben Skeggs <bskeggs@redhat.com> 1291352796 +1000

drm/nouveau: Fix race condition in channel refcount handling.

nouveau_channel_put() can be executed after the 'refcount == 0' check
in nouveau_channel_get() and before the channel reference count is
incremented. In that case CPU0 will take the context down while CPU1
thinks it owns the channel and 'refcount == 1'.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>