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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: DRI Development <dri-devel@lists.freedesktop.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: [PATCH 07/13] drm/exynos: drop struct_mutex from exynos_gem_map_sgt_with_dma
Date: Wed, 30 Mar 2016 11:40:46 +0200	[thread overview]
Message-ID: <1459330852-27668-8-git-send-email-daniel.vetter@ffwll.ch> (raw)
In-Reply-To: <1459330852-27668-1-git-send-email-daniel.vetter@ffwll.ch>

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>
---
 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;
 }
 
-- 
2.8.0.rc3

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  parent reply	other threads:[~2016-03-30  9:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-30  9:40 [PATCH 00/13] Gem cleanup&fixes resend, once more Daniel Vetter
2016-03-30  9:40 ` [PATCH 01/13] drm/nouveau: Use unlocked gem unreferencing Daniel Vetter
2016-03-30  9:40 ` [PATCH 02/13] drm/omapdrm: " Daniel Vetter
2016-04-18 16:15   ` Tomi Valkeinen
2016-04-20 10:55     ` Daniel Vetter
2016-04-20 13:52   ` Laurent Pinchart
2016-03-30  9:40 ` [PATCH 03/13] drm/qxl: " Daniel Vetter
2016-03-30  9:40 ` [PATCH 04/13] drm/udl: " Daniel Vetter
2016-03-30 10:55   ` poma
2016-03-30  9:40 ` [PATCH 05/13] drm/nouveau: Drop dev->struct_mutex from fbdev init Daniel Vetter
2016-03-30  9:40 ` [PATCH 06/13] drm/exynos: Drop dev->struct_mutex from mmap offset function Daniel Vetter
2016-03-30  9:40 ` Daniel Vetter [this message]
2016-03-30 10:23   ` [PATCH 07/13] drm/exynos: drop struct_mutex from exynos_gem_map_sgt_with_dma Emil Velikov
2016-03-30  9:40 ` [PATCH 08/13] drm/exynos: drop struct_mutex from exynos_drm_gem_get_ioctl Daniel Vetter
2016-03-30  9:40 ` [PATCH 09/13] drm/exynos: drop struct_mutex from fbdev setup Daniel Vetter
2016-03-30  9:40 ` [PATCH 10/13] drm/vgem: Simplify dum_map Daniel Vetter
2016-03-30 10:29   ` Emil Velikov
2016-03-30 10:31     ` Daniel Stone
2016-03-30  9:40 ` [PATCH 11/13] drm/vgem: Move get_pages to gem_create Daniel Vetter
2016-03-30  9:40 ` [PATCH 12/13] drm/vgem: Drop dev->struct_mutex Daniel Vetter
2016-03-30  9:40 ` [PATCH 13/13] drm/vma_manage: Drop has_offset Daniel Vetter

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