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drm/i915: Simplify releasing context reference

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A few users only take the struct_mutex in order to release a reference
to a context. We can expose a kref_put_mutex() wrapper in order to
simplify these users, and optimise taking of the mutex to the final
unref.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161218153724.8439-4-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-12-18 15:37:21 +00:00
parent e8a9c58fcd
commit 69df05e11a
2 changed files with 11 additions and 12 deletions
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7
drivers/gpu/drm/i915/i915_drv.h
View file

@ -3518,6 +3518,13 @@ static inline void i915_gem_context_put(struct i915_gem_context *ctx)
kref_put(&ctx->ref, i915_gem_context_free);
}
static inline void i915_gem_context_put_unlocked(struct i915_gem_context *ctx)
{
kref_put_mutex(&ctx->ref,
i915_gem_context_free,
&ctx->i915->drm.struct_mutex);
}
static inline struct intel_timeline *
i915_gem_context_lookup_timeline(struct i915_gem_context *ctx,
struct intel_engine_cs *engine)

16
drivers/gpu/drm/i915/i915_perf.c
View file

@ -1555,8 +1555,6 @@ static long i915_perf_ioctl(struct file *file,
*/
static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
{
struct drm_i915_private *dev_priv = stream->dev_priv;
if (stream->enabled)
i915_perf_disable_locked(stream);
@ -1565,11 +1563,8 @@ static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
list_del(&stream->link);
if (stream->ctx) {
mutex_lock(&dev_priv->drm.struct_mutex);
i915_gem_context_put(stream->ctx);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
if (stream->ctx)
i915_gem_context_put_unlocked(stream->ctx);
kfree(stream);
}
@ -1738,11 +1733,8 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
err_alloc:
kfree(stream);
err_ctx:
if (specific_ctx) {
mutex_lock(&dev_priv->drm.struct_mutex);
i915_gem_context_put(specific_ctx);
mutex_unlock(&dev_priv->drm.struct_mutex);
}
if (specific_ctx)
i915_gem_context_put_unlocked(specific_ctx);
err:
return ret;
}