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drm/msm: Unblock writer if reader closes file

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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>
This commit is contained in:
Kristian H. Kristensen 2018-12-19 08:57:41 -08:00 committed by Rob Clark
parent ba0ede185e
commit 99c66bc051
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/msm/msm_rd.c
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@ -115,7 +115,9 @@ 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
@ -213,7 +215,10 @@ static int rd_open(struct inode *inode, struct file *file)
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;
}