linux-kernel - [PATCH 4.2.y-ckt 109/305] drm/rockchip: unset pgoff when mmap'ing gems

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Message-Id: <1452902519-2754-110-git-send-email-kamal@canonical.com>
Date:	Fri, 15 Jan 2016 15:58:43 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 109/305] drm/rockchip: unset pgoff when mmap'ing gems

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Heiko Stuebner <heiko@...ech.de>

commit a8594f20cafadb6ba58f915dea5f2c94a9333b1a upstream.

Commit 371f0f085f629 ("ARM: 8426/1: dma-mapping: add missing range check
 in dma_mmap()") introduced offset-checking for mappings, which collides
with the fake-offset the drm sets for gems.

Other drm-drivers set this offset to 0 before doing the mapping, so
this looks like the correct way to go for rockchip as well.

Fixes: 371f0f085f629 ("ARM: 8426/1: dma-mapping: add missing range check in dma_mmap()")
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index eba5f8a..2d1daac 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -67,6 +67,7 @@ static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,
 	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
 	 */
 	vma->vm_flags &= ~VM_PFNMAP;
+	vma->vm_pgoff = 0;
 
 	ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,
 			     obj->size, &rk_obj->dma_attrs);
-- 
1.9.1