If the user is racing a call to debugfs/i915_drop_caches with ongoing
submission from another thread/process, we may never end up idling the
GPU and be uninterruptibly spinning in debugfs/i915_drop_caches trying
to catch an idle moment.
Just flush the work once, that should be enough to park the system under
correct conditions. Outside of those we either have a driver bug or the
user is racing themselves. Sadly, because the user may be provoking the
unwanted situation we can't put a warn here to attract attention to a
probable bug.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 7e8898d0b78b..2ecefacb1e66 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3933,9 +3933,7 @@ i915_drop_caches_set(void *data, u64 val)
fs_reclaim_release(GFP_KERNEL);
if (val & DROP_IDLE) {
- do {
- flush_delayed_work(&i915->gem.retire_work);
- } while (READ_ONCE(i915->gt.awake));
+ flush_delayed_work(&i915->gem.retire_work);
flush_work(&i915->gem.idle_work);
}
--
2.20.1
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