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

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Date:   Tue, 31 Oct 2017 10:55:56 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 4.13 36/43] drm/i915/perf: fix perf enable/disable ioctls with 32bits userspace

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

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

From: Lionel Landwerlin <lionel.g.landwerlin@...el.com>

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@...el.com>
Fixes: eec688e1420 ("drm/i915: Add i915 perf infrastructure")
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171024152728.4873-1-lionel.g.landwerlin@intel.com
(cherry picked from commit 191f896085cf3b5d85920d58a759da4eea141721)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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,
 };