[PATCH v1 05/11] drm/vblank: drop use of DRM_WAIT_ON()

Sam Ravnborg
2019-07-18T16:15:01Z

DRM_WAIT_ON() is from the deprecated drm_os_linux header and
the modern replacement is the wait_event_*.

The return values differ, so a conversion is needed to
keep the original interface towards userspace.
Introduced a switch/case to make code obvious and to allow
different debug prints depending on the result.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
drivers/gpu/drm/drm_vblank.c | 29 ++++++++++++++++++++---------
1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 603ab105125d..8e9ac187500e 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -31,7 +31,6 @@
#include <drm/drm_drv.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_print.h>
-#include <drm/drm_os_linux.h>
#include <drm/drm_vblank.h>

#include "drm_internal.h"
@@ -1672,19 +1671,31 @@ int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
if (req_seq != seq) {
DRM_DEBUG("waiting on vblank count %llu, crtc %u\n",
req_seq, pipe);
- DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
- vblank_passed(drm_vblank_count(dev, pipe),
- req_seq) ||
- !READ_ONCE(vblank->enabled));
+ ret = wait_event_interruptible_timeout(vblank->queue,
+ vblank_passed(drm_vblank_count(dev, pipe), req_seq) ||
+ !READ_ONCE(vblank->enabled),
+ msecs_to_jiffies(3000));
}

- if (ret != -EINTR) {
+ switch (ret) {
+ case 0:
+ /* timeout */
+ ret = -EBUSY;
drm_wait_vblank_reply(dev, pipe, &vblwait->reply);
-
- DRM_DEBUG("crtc %d returning %u to client\n",
+ DRM_DEBUG("timeout waiting for vblank. crtc %d returning %u to client\n",
pipe, vblwait->reply.sequence);
- } else {
+ break;
+ case -ERESTARTSYS:
+ /* interrupted by signal */
+ ret = -EINTR;
DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe);
+ break;
+ default:
+ ret = 0;
+ drm_wait_vblank_reply(dev, pipe, &vblwait->reply);
+ DRM_DEBUG("crtc %d returning %u to client\n",
+ pipe, vblwait->reply.sequence);
+ break;
}

done:
--
2.20.1