On 03/04/2017 11:51, Chris Wilson wrote:
If the signal to park arrives before we sleep, then we need to check kthread_should_park() before sleeping to avoid missing the signal. Otherwise, if the signal arrives whilst we are processing completed requests, we will reset the current->state back to TASK_INTERRUPTIBLE and so miss the wakeup.Fixes: fe3288b5da2c ("drm/i915: Park the breadcrumbs signaler across a GPU reset") Signed-off-by: Chris Wilson <[email protected]> Cc: Mika Kuoppala <[email protected]> Cc: Tvrtko Ursulin <[email protected]> --- drivers/gpu/drm/i915/intel_breadcrumbs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index b6ea192ad550..308c56a021ab 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -629,6 +629,9 @@ static int intel_breadcrumbs_signaler(void *arg) } else { DEFINE_WAIT(exec); + if (kthread_should_park()) + kthread_parkme(); + if (kthread_should_stop()) { GEM_BUG_ON(request); break; @@ -641,9 +644,6 @@ static int intel_breadcrumbs_signaler(void *arg) if (request) remove_wait_queue(&request->execute, &exec); - - if (kthread_should_park()) - kthread_parkme(); } i915_gem_request_put(request); } while (1);
Reviewed-by: Tvrtko Ursulin <[email protected]> Regards, Tvrtko _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
