From: Alexander Usyskin <[email protected]> In the course of the read flow we want to wait for read completion only if the read queue is empty. However the calling list_empty(&cl->rd_completed) is a duplication as the same check was performed by mei_cl_read_cb() and the waiting is skipped if it returns not NULL.
Signed-off-by: Alexander Usyskin <[email protected]> Signed-off-by: Tomas Winkler <[email protected]> --- drivers/misc/mei/bus.c | 3 ++- drivers/misc/mei/main.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 1f33fea9299f..63411ddfb83d 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -126,7 +126,8 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) goto out; /* wait on event only if there is no other waiter */ - if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { + /* synchronized under device mutex */ + if (!waitqueue_active(&cl->rx_wait)) { mutex_unlock(&bus->device_lock); diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index a8d0471f817f..3326bde7fba1 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -183,7 +183,8 @@ static ssize_t mei_read(struct file *file, char __user *ubuf, goto out; } - if (list_empty(&cl->rd_completed) && !waitqueue_active(&cl->rx_wait)) { + /* synchronized under device mutex */ + if (!waitqueue_active(&cl->rx_wait)) { if (file->f_flags & O_NONBLOCK) { rets = -EAGAIN; goto out; -- 2.5.5
