diff options
| author | Kristian H. Kristensen <hoegsberg@gmail.com> | 2018-12-19 08:57:41 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-05 17:57:58 +0100 |
| commit | 7796c2a06e1f0236edb5e43af8d995e1b2a8d64d (patch) | |
| tree | 2c234c0d456b5711943d4814bcd12caac8a557ed | |
| parent | fe1c7cf1a24e22b88eaa007a7c3f25b18ae7e1de (diff) | |
drm/msm: Unblock writer if reader closes file
[ Upstream commit 99c66bc051e7407fe0bf0607b142ec0be1a1d1dd ]
Prevents deadlock when fifo is full and reader closes file.
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/msm/msm_rd.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c index ec56794ad039..bdce1c9434c6 100644 --- a/drivers/gpu/drm/msm/msm_rd.c +++ b/drivers/gpu/drm/msm/msm_rd.c @@ -109,7 +109,9 @@ static void rd_write(struct msm_rd_state *rd, const void *buf, int sz) char *fptr = &fifo->buf[fifo->head]; int n; - wait_event(rd->fifo_event, circ_space(&rd->fifo) > 0); + wait_event(rd->fifo_event, circ_space(&rd->fifo) > 0 || !rd->open); + if (!rd->open) + return; /* Note that smp_load_acquire() is not strictly required * as CIRC_SPACE_TO_END() does not access the tail more @@ -207,7 +209,10 @@ out: static int rd_release(struct inode *inode, struct file *file) { struct msm_rd_state *rd = inode->i_private; + rd->open = false; + wake_up_all(&rd->fifo_event); + return 0; } |