linux-kernel - [PATCH AUTOSEL for 4.15 027/102] drm/vblank: Fix vblank timestamp debugs

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Date:   Sat, 3 Mar 2018 22:24:25 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Keith Packard <keithp@...thp.com>,
        Sean Paul <seanpaul@...omium.org>,
        Dave Airlie <airlied@...hat.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 027/102] drm/vblank: Fix vblank timestamp
 debugs

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

[ Upstream commit bcbec31ce500fe036f75a19bca5c73bfa6dd420b ]

We're currently calling ktime_to_timespec64() on stack garbage
hence the debug output for vblank timestamps also contains garbage.
Let's assing something to the ktime_t first before we go converting
it to a timespec.

While at it micro-optimize the ktime_to_timespec64() calls away
when vblank debugging isn't enabled.

Fixes: 67680d3c0464 ("drm: vblank: use ktime_t instead of timeval")
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Keith Packard <keithp@...thp.com>
Cc: Sean Paul <seanpaul@...omium.org>
Cc: Dave Airlie <airlied@...hat.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171113150210.11311-1-ville.syrjala@linux.intel.com
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/drm_vblank.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 3717b3df34a4..32d9bcf5be7f 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -663,14 +663,16 @@ bool drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
 	delta_ns = div_s64(1000000LL * (vpos * mode->crtc_htotal + hpos),
 			   mode->crtc_clock);
 
-	/* save this only for debugging purposes */
-	ts_etime = ktime_to_timespec64(etime);
-	ts_vblank_time = ktime_to_timespec64(*vblank_time);
 	/* Subtract time delta from raw timestamp to get final
 	 * vblank_time timestamp for end of vblank.
 	 */
-	etime = ktime_sub_ns(etime, delta_ns);
-	*vblank_time = etime;
+	*vblank_time = ktime_sub_ns(etime, delta_ns);
+
+	if ((drm_debug & DRM_UT_VBL) == 0)
+		return true;
+
+	ts_etime = ktime_to_timespec64(etime);
+	ts_vblank_time = ktime_to_timespec64(*vblank_time);
 
 	DRM_DEBUG_VBL("crtc %u : v p(%d,%d)@ %lld.%06ld -> %lld.%06ld [e %d us, %d rep]\n",
 		      pipe, hpos, vpos,
-- 
2.14.1