From 8e97d9ef362e65f2533366527cdafa1842dab201 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 30 Mar 2016 11:40:46 +0200 Subject: [PATCH] drm/exynos: drop struct_mutex from exynos_gem_map_sgt_with_dma 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 Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1459330852-27668-8-git-send-email-daniel.vetter@ffwll.ch --- drivers/gpu/drm/exynos/exynos_drm_gem.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index 3b7209335df0..60b9975bb0b1 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -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; } -- 2.20.1