[Intel-gfx] [PATCH v2] drm/i915: fix pm refcounting on fence error in execbuf

[Daniele Ceraolo Spurio]

Fences are creted/checked before the pm ref is taken, so if we jump to
pre_mutex_err we will uncorrectly call intel_runtime_pm_put.

v2: transform unwind sequence (Chris)

Fixes: fec0445caa27 (drm/i915: Support explicit fencing for execbuf)
Testcase: igt/gem_exec_params
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index a40ade6..8987d38 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1643,18 +1643,15 @@ static void eb_export_fence(struct drm_i915_gem_object *obj,
 
 	if (args->flags & I915_EXEC_FENCE_IN) {
 		in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2));
-		if (!in_fence) {
-			ret = -EINVAL;
-			goto pre_mutex_err;
-		}
+		if (!in_fence)
+			return -EINVAL;
 	}
 
 	if (args->flags & I915_EXEC_FENCE_OUT) {
 		out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
 		if (out_fence_fd < 0) {
 			ret = out_fence_fd;
-			out_fence_fd = -1;
-			goto pre_mutex_err;
+			goto err_in_fence;
 		}
 	}
 
@@ -1877,6 +1874,8 @@ static void eb_export_fence(struct drm_i915_gem_object *obj,
 	intel_runtime_pm_put(dev_priv);
 	if (out_fence_fd != -1)
 		put_unused_fd(out_fence_fd);
+
+err_in_fence:
 	dma_fence_put(in_fence);
 	return ret;
 }
-- 
1.9.1