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author | Alex Waterman <alexw@nvidia.com> | 2016-01-21 17:50:23 -0500 |
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committer | Alex Waterman <alexw@nvidia.com> | 2016-01-27 13:59:00 -0500 |
commit | f7d219dd1c95ba9de2349b4de9f8cb510ec001cb (patch) | |
tree | ae250744ba1c042b9ac82630af89d4e1b8a16e82 /drivers/gpu/nvgpu/gk20a/hal.c | |
parent | aa74098f29b3027111baf17c21d6e30a3656e2d0 (diff) |
gpu: nvgpu: Fix semaphore race condition
A race condition existed in gk20a_channel_semaphore_wait_fd().
In some instances the semaphore underlying the sync_fence being
waited on would have already signaled. This would cause the
subsequent sync_fence_wait_async() call to return 1 and do
nothing. Normally, the sync_fence_wait_async() call would
release the newly created semaphore but in the above case that
would not happen and hang any channel waiting on that semaphore.
To fix this problem if sync_fence_wait_async() returns 1
immediately release the newly created semaphore.
Bug 1604892
Change-Id: I1f5e811695bb099f71b7762835aba4a7e27362ec
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/935910
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Diffstat (limited to 'drivers/gpu/nvgpu/gk20a/hal.c')
0 files changed, 0 insertions, 0 deletions