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[v6,5/7] drm/i915: move locking in i915_gem_unmap_dma_buf()

Message ID 1456780572-19196-6-git-send-email-david.s.gordon@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dave Gordon Feb. 29, 2016, 9:16 p.m. UTC 
From: Chris Wilson <chris@chris-wilson.co.uk>

The struct_mutex doesn't need to be (and therefore shouldn't be)
held around the various non-i915 operations in this function. We
only need the struct_mutex when we get to the unpin_pages() call.

Extracted from Chris Wilson's patch:
    drm/i915: Refactor duplicate object vmap functions
in preparation for the reimplementation of the same.

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_dmabuf.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
index aee4149..68e21d1 100644
--- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -95,14 +95,12 @@  static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
 {
 	struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
 
-	mutex_lock(&obj->base.dev->struct_mutex);
-
 	dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
 	sg_free_table(sg);
 	kfree(sg);
 
+	mutex_lock(&obj->base.dev->struct_mutex);
 	i915_gem_object_unpin_pages(obj);
-
 	mutex_unlock(&obj->base.dev->struct_mutex);
 }