linux-kernel - [PATCH v2 v3.18-rc4 4/4] drm: sti: Honour O

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Date:	Wed, 12 Nov 2014 11:38:15 +0000
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	David Airlie <airlied@...ux.ie>
Cc:	Daniel Thompson <daniel.thompson@...aro.org>,
	dri-devel@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>
Subject: [PATCH v2 v3.18-rc4 4/4] drm: sti: Honour O_RDWR during prime-handle-to-fd

Currently the sti drm driver forcible applies O_RDWR when it exports
a prime handle. This is because it was not previously possible for
user requests to create the fd with O_RDWR passed into drivers.

This is a cleanup to remove this code. This change has obvious impact
upon the userspace which must change the flags passed to
DRM_IOCTL_PRIME_HANDLE_TO_FD. However at present only a tiny handful of
developers run this userspace and, if they don't complain, nobody else
will.

Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
---
 drivers/gpu/drm/sti/sti_drm_drv.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_drm_drv.c b/drivers/gpu/drm/sti/sti_drm_drv.c
index 223d93c3a05d..320167e1520a 100644
--- a/drivers/gpu/drm/sti/sti_drm_drv.c
+++ b/drivers/gpu/drm/sti/sti_drm_drv.c
@@ -93,15 +93,6 @@ static const struct file_operations sti_drm_driver_fops = {
 	.release = drm_release,
 };
 
-static struct dma_buf *sti_drm_gem_prime_export(struct drm_device *dev,
-						struct drm_gem_object *obj,
-						int flags)
-{
-	/* we want to be able to write in mmapped buffer */
-	flags |= O_RDWR;
-	return drm_gem_prime_export(dev, obj, flags);
-}
-
 static struct drm_driver sti_drm_driver = {
 	.driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 	    DRIVER_GEM | DRIVER_PRIME,
@@ -119,7 +110,7 @@ static struct drm_driver sti_drm_driver = {
 
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
-	.gem_prime_export = sti_drm_gem_prime_export,
+	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_import = drm_gem_prime_import,
 	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
-- 
1.9.3

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