Patch "drm/syncobj: fix DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/syncobj: fix DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-syncobj-fix-drm_syncobj_wait_flags_wait_availabl.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 51d1f0dfff5dfd8ecd18b2c9415e282457367a0a
Author: Erik Kurzinger <ekurzinger@xxxxxxxxxx>
Date:   Wed Aug 16 09:26:05 2023 -0700

    drm/syncobj: fix DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE
    
    [ Upstream commit 101c9f637efa1655f55876644d4439e552267527 ]
    
    If DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT is invoked with the
    DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE flag set but no fence has yet been
    submitted for the given timeline point the call will fail immediately
    with EINVAL. This does not match the intended behavior where the call
    should wait until the fence has been submitted (or the timeout expires).
    
    The following small example program illustrates the issue. It should
    wait for 5 seconds and then print ETIME, but instead it terminates right
    away after printing EINVAL.
    
      #include <stdio.h>
      #include <fcntl.h>
      #include <time.h>
      #include <errno.h>
      #include <xf86drm.h>
      int main(void)
      {
          int fd = open("/dev/dri/card0", O_RDWR);
          uint32_t syncobj;
          drmSyncobjCreate(fd, 0, &syncobj);
          struct timespec ts;
          clock_gettime(CLOCK_MONOTONIC, &ts);
          uint64_t point = 1;
          if (drmSyncobjTimelineWait(fd, &syncobj, &point, 1,
                                     ts.tv_sec * 1000000000 + ts.tv_nsec + 5000000000, // 5s
                                     DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE, NULL)) {
              printf("drmSyncobjTimelineWait failed %d\n", errno);
          }
      }
    
    Fixes: 01d6c3578379 ("drm/syncobj: add support for timeline point wait v8")
    Signed-off-by: Erik Kurzinger <ekurzinger@xxxxxxxxxx>
    Reviewed by: Simon Ser <contact@xxxxxxxxxxx>
    Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/1fac96f1-2f3f-f9f9-4eb0-340f27a8f6c0@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 7e48dcd1bee4d..c26f916996352 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1056,7 +1056,8 @@ static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 		fence = drm_syncobj_fence_get(syncobjs[i]);
 		if (!fence || dma_fence_chain_find_seqno(&fence, points[i])) {
 			dma_fence_put(fence);
-			if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
+			if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
+				     DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
 				continue;
 			} else {
 				timeout = -EINVAL;