drm/i915: use mutex_lock_interruptible for debugfs files

It's no fun if your shell hangs when the driver has gone on vacation
and you want to know why ...

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-08-09 15:07:02 +02:00
commit 22bcfc6a4b