linux-kernel - [PATCH] drm/i915: Fix typo in DRM_I915_OVERLAY_PUT

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Date:	Fri, 22 Apr 2011 03:36:24 +0200
From:	Ole Henrik Jahren <olehenja@...mni.ntnu.no>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: [PATCH] drm/i915: Fix typo in DRM_I915_OVERLAY_PUT_IMAGE ioctl define

Calling ioctl with DRM_IOCTL_I915_OVERLAY_PUT_IMAGE is broken if the
macro is used directly, because the define contains a typo. When using
libdrm you do not hit the bug, since libdrm handles the ioctl encoding
internally.

The typo also leads to the .cmd and .cmd_drv fields of the drm_ioctl
structure for DRM_I915_OVERLAY_PUT_IMAGE having inconsistent content.

Signed-off-by: Ole Henrik Jahren <olehenja@...mni.ntnu.no>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---

Included a bit more explanation about the problem. The impact of the
inconsistency between .cmd and .cmd_drv does not seem to have any impact,
since the only thing .cmd_drv seems to be used for is calculating the
size of the copy_from_user() buffer. It incidentally result in the same
size both with and without this patch (at least on 64bit).

 include/drm/i915_drm.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 0039f1f..ca7b8af 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -237,7 +237,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_IOCTL_I915_GEM_GET_APERTURE	DRM_IOR  (DRM_COMMAND_BASE + DRM_I915_GEM_GET_APERTURE, struct drm_i915_gem_get_aperture)
 #define DRM_IOCTL_I915_GET_PIPE_FROM_CRTC_ID DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GET_PIPE_FROM_CRTC_ID, struct drm_i915_get_pipe_from_crtc_id)
 #define DRM_IOCTL_I915_GEM_MADVISE	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_MADVISE, struct drm_i915_gem_madvise)
-#define DRM_IOCTL_I915_OVERLAY_PUT_IMAGE	DRM_IOW(DRM_COMMAND_BASE + DRM_IOCTL_I915_OVERLAY_ATTRS, struct drm_intel_overlay_put_image)
+#define DRM_IOCTL_I915_OVERLAY_PUT_IMAGE	DRM_IOW(DRM_COMMAND_BASE + DRM_I915_OVERLAY_PUT_IMAGE, struct drm_intel_overlay_put_image)
 #define DRM_IOCTL_I915_OVERLAY_ATTRS	DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_OVERLAY_ATTRS, struct drm_intel_overlay_attrs)
 
 /* Allow drivers to submit batchbuffers directly to hardware, relying
-- 
1.7.5.rc1

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