linux-kernel - [PATCH 3.14 26/94] drm/nouveau/kms: reference vblank for crtc during pageflip.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20140707235757.542191979@linuxfoundation.org>
Date:	Mon,  7 Jul 2014 16:57:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mario Kleiner <mario.kleiner.de@...il.com>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: [PATCH 3.14 26/94] drm/nouveau/kms: reference vblank for crtc during pageflip.

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

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

From: Mario Kleiner <mario.kleiner.de@...il.com>

commit ba124a41058b300a5464206d2d33803cc3dc82ec upstream.

Need to drm_vblank_get/put() the crtc involved in a
pending pageflip, or we might not get vblank irqs and
updates of vblank counts and timestamps for pageflip
events and flip completion.

Signed-off-by: Mario Kleiner <mario.kleiner.de@...il.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_display.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -734,6 +734,9 @@ nouveau_crtc_page_flip(struct drm_crtc *
 		  fb->bits_per_pixel, fb->pitches[0], crtc->x, crtc->y,
 		  new_bo->bo.offset };
 
+	/* Keep vblanks on during flip, for the target crtc of this flip */
+	drm_vblank_get(dev, nouveau_crtc(crtc)->index);
+
 	/* Emit a page flip */
 	if (nv_device(drm->device)->card_type >= NV_50) {
 		ret = nv50_display_flip_next(crtc, fb, chan, swap_interval);
@@ -777,6 +780,7 @@ nouveau_crtc_page_flip(struct drm_crtc *
 	return 0;
 
 fail_unreserve:
+	drm_vblank_put(dev, nouveau_crtc(crtc)->index);
 	ttm_bo_unreserve(&old_bo->bo);
 fail_unpin:
 	mutex_unlock(&chan->cli->mutex);
@@ -815,6 +819,9 @@ nouveau_finish_page_flip(struct nouveau_
 		drm_send_vblank_event(dev, crtcid, s->event);
 	}
 
+	/* Give up ownership of vblank for page-flipped crtc */
+	drm_vblank_put(dev, s->crtc);
+
 	list_del(&s->head);
 	if (ps)
 		*ps = *s;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/