[PATCH] drm/i915: fix remaining_timeout in intel_gt_retire_requests_timeout

[Daniele Ceraolo Spurio]

In intel_gt_wait_for_idle, we use the remaining timeout returned from
intel_gt_retire_requests_timeout to wait on the GuC being idle. However,
the returned variable can have a negative value if something goes wrong
during the wait, leading to us hitting a GEM_BUG_ON in the GuC wait
function.
To fix this, make sure to only return the timeout if it is positive.

Fixes: b97060a99b01b ("drm/i915/guc: Update intel_gt_wait_for_idle to work with GuC")
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: John Harrison <john.c.harrison at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt_requests.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
index edb881d756309..ef70c209976d8 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_requests.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c
@@ -197,7 +197,7 @@ out_active:	spin_lock(&timelines->lock);
 		active_count++;
 
 	if (remaining_timeout)
-		*remaining_timeout = timeout;
+		*remaining_timeout = timeout > 0 ? timeout : 0;
 
 	return active_count ? timeout : 0;
 }
-- 
2.25.1