From: Christian König <deathsimple@vodafone.de>
Date: Mon, 25 Jun 2012 13:13:50 +0000 (+0200)
Subject: drm/radeon: add error handling to radeon_vm_unbind_locked
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=35e56bd0a42f06b215741fb94bc8d1e42e946449;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

drm/radeon: add error handling to radeon_vm_unbind_locked

Waiting for a fence can fail for different reasons,
the most common is a deadlock.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index 2b34c1a91421..ee11c5073726 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);