staging: most: cdev: fix race condition (993c1637) · Commits · 戴 / test

This patch fixes a race condition between the functions disconnect and poll. Signed-off-by:

drivers/staging/most/cdev/cdev.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}