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authorDaniel Vetter <daniel.vetter@ffwll.ch>2015-09-28 21:42:40 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-10-16 15:50:54 +0200
commitea487835e8876abf7ad909636e308c801a2bcda6 (patch)
treeead40458ef2c4f333228113e38d7facb01475a50 /Documentation/DocBook/drm.tmpl
parentdrm/i915: Mark getparam ioctl as DRM_UNLOCKED (diff)
downloadlinux-dev-ea487835e8876abf7ad909636e308c801a2bcda6.tar.xz
linux-dev-ea487835e8876abf7ad909636e308c801a2bcda6.zip
drm: Enforce unlocked ioctl operation for kms driver ioctls
With the prep patches for i915 all kms drivers either have DRM_UNLOCKED on all their ioctls. Or the ioctl always directly returns with an invariant return value when in modeset mode. But that's only the case for i915 and radeon. The drm core ioctls are unfortunately too much a mess still to dare this. Follow-up patches will remove DRM_UNLOCKED from all kms drivers to prove that this is indeed the case. Also update the documentation. v2: Really only do this for driver ioctls, spotted by David Herrmann. And drop spurious whitespace change. Cc: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Christian K├Ânig <christian.koenig@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'Documentation/DocBook/drm.tmpl')
-rw-r--r--Documentation/DocBook/drm.tmpl4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 8d0cbf10cbba..2bc6c80065ce 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -3684,7 +3684,9 @@ int num_ioctls;</synopsis>
</para></listitem>
<listitem><para>
DRM_UNLOCKED - The ioctl handler will be called without locking
- the DRM global mutex
+ the DRM global mutex. This is the enforced default for kms drivers
+ (i.e. using the DRIVER_MODESET flag) and hence shouldn't be used
+ any more for new drivers.
</para></listitem>
</itemizedlist>
</para>