[PATCH 4.13 36/43] drm/i915/perf: fix perf enable/disable ioctls with 32bits userspace

[Greg Kroah-Hartman]

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>

commit 7277f755048da562eb2489becacd38d0d05e1e06 upstream.

The compat callback was missing and triggered failures in 32bits
userspace when enabling/disable the perf stream. We don't require any
particular processing here as these ioctls don't take any argument.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
Fixes: eec688e1420 ("drm/i915: Add i915 perf infrastructure")
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024152728.4873-1-lionel.g.landwerlin@xxxxxxxxx
(cherry picked from commit 191f896085cf3b5d85920d58a759da4eea141721)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/i915_perf.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2480,6 +2480,10 @@ static const struct file_operations fops
 	.poll		= i915_perf_poll,
 	.read		= i915_perf_read,
 	.unlocked_ioctl	= i915_perf_ioctl,
+	/* Our ioctl have no arguments, so it's safe to use the same function
+	 * to handle 32bits compatibility.
+	 */
+	.compat_ioctl   = i915_perf_ioctl,
 };