Waiting for a fence can fail for different reasons, the most common is a deadlock.
Signed-off-by: Christian König deathsimple@vodafone.de --- drivers/gpu/drm/radeon/radeon_gart.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c index 2b34c1a..ee11c50 100644 --- a/drivers/gpu/drm/radeon/radeon_gart.c +++ b/drivers/gpu/drm/radeon/radeon_gart.c @@ -316,10 +316,21 @@ static void radeon_vm_unbind_locked(struct radeon_device *rdev, }
/* wait for vm use to end */ - if (vm->fence) { - radeon_fence_wait(vm->fence, false); - radeon_fence_unref(&vm->fence); + while (vm->fence) { + int r; + r = radeon_fence_wait(vm->fence, false); + if (r) + DRM_ERROR("error while waiting for fence: %d\n", r); + if (r == -EDEADLK) { + mutex_unlock(&rdev->vm_manager.lock); + r = radeon_gpu_reset(rdev); + mutex_lock(&rdev->vm_manager.lock); + if (!r) + continue; + } + break; } + radeon_fence_unref(&vm->fence);
/* hw unbind */ rdev->vm_manager.funcs->unbind(rdev, vm);