I opted to do this instead of grabbing the context reference after
eb_create since eb_create can potentially call the shrinker, and that
makes things very complicated. This simple patch balances the ref count
without requiring a great deal of review to make sure the shrinker path
is safe.
Theoretically (by design) the shrinker can end up destroying a context,
which enforces the reasoning for doing the fix this way instead of
moving the reference to later in the function.
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index e4f0e2c..b785459 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1133,7 +1133,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
mutex_unlock(&dev->struct_mutex);
ret = PTR_ERR(ctx);
goto pre_mutex_err;
- }
+ }
i915_gem_context_reference(ctx);
@@ -1143,6 +1143,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
eb = eb_create(args);
if (eb == NULL) {
+ i915_gem_context_unreference(ctx);
mutex_unlock(&dev->struct_mutex);
ret = -ENOMEM;
goto pre_mutex_err;
--
1.9.1
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