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drm/exynos: drop struct_mutex from exynos_gem_map_sgt_with_dma

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The sg table isn't refcounted, there's no corresponding locking for
unmapping and drm_map_sg is ok with being called concurrently.

So drop the locking since it doesn't protect anything.

Cc: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459330852-27668-8-git-send-email-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2016-03-30 11:40:46 +02:00
parent 91263622f1
commit 8e97d9ef36
1 changed files with 0 additions and 4 deletions
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4
drivers/gpu/drm/exynos/exynos_drm_gem.c
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@ -388,16 +388,12 @@ int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
{
int nents;
mutex_lock(&drm_dev->struct_mutex);
nents = dma_map_sg(to_dma_dev(drm_dev), sgt->sgl, sgt->nents, dir);
if (!nents) {
DRM_ERROR("failed to map sgl with dma.\n");
mutex_unlock(&drm_dev->struct_mutex);
return nents;
}
mutex_unlock(&drm_dev->struct_mutex);
return 0;
}