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drm: Enforce unlocked ioctl operation for kms driver ioctls

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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 <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: David Herrmann <[email protected]>
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
This commit is contained in:
Daniel Vetter 2015-09-28 21:42:40 +02:00
commit ea487835e8
2 changed files with 11 additions and 3 deletions
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4
Documentation/DocBook/drm.tmpl
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@ -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>