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drm/i915/gem: Silence sparse for RCU protection inside the constructor 

Inside the constructor, while cloning, we need to replace the
dst->engines. Having forgotten that dst->engines is marked as RCU
protected, we need to add the appropriate annotations to make sparse
happy.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114225736.616885-5-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-11-14 22:57:36 +00:00
parent 7936a22dd4
commit d96bb620fc
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/gem/i915_gem_context.c
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@ -2009,7 +2009,8 @@ static int clone_engines(struct i915_gem_context *dst,
user_engines = i915_gem_context_user_engines(src);
i915_gem_context_unlock_engines(src);
free_engines(dst->engines);
/* Serialised by constructor */
free_engines(__context_engines_static(dst));
RCU_INIT_POINTER(dst->engines, clone);
if (user_engines)
i915_gem_context_set_user_engines(dst);
@ -2044,7 +2045,8 @@ static int clone_sseu(struct i915_gem_context *dst,
unsigned long n;
int err;
clone = dst->engines; /* no locking required; sole access */
/* no locking required; sole access under constructor*/
clone = __context_engines_static(dst);
if (e->num_engines != clone->num_engines) {
err = -EINVAL;
goto unlock;