diff options
| -rw-r--r-- | drivers/staging/most/cdev/cdev.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/staging/most/cdev/cdev.c b/drivers/staging/most/cdev/cdev.c index 8e7652545402..4569838f27a0 100644 --- a/drivers/staging/most/cdev/cdev.c +++ b/drivers/staging/most/cdev/cdev.c @@ -292,13 +292,15 @@ static __poll_t comp_poll(struct file *filp, poll_table *wait) poll_wait(filp, &c->wq, wait); + mutex_lock(&c->io_mutex); if (c->cfg->direction == MOST_CH_RX) { - if (!kfifo_is_empty(&c->fifo)) + if (!c->dev || !kfifo_is_empty(&c->fifo)) mask |= EPOLLIN | EPOLLRDNORM; } else { - if (!kfifo_is_empty(&c->fifo) || ch_has_mbo(c)) + if (!c->dev || !kfifo_is_empty(&c->fifo) || ch_has_mbo(c)) mask |= EPOLLOUT | EPOLLWRNORM; } + mutex_unlock(&c->io_mutex); return mask; } |