[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1466089139-8078-3-git-send-email-tomas.winkler@intel.com>
Date: Thu, 16 Jun 2016 17:58:54 +0300
From: Tomas Winkler <tomas.winkler@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alexander Usyskin <alexander.usyskin@...el.com>,
linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 3/8] mei: drop read complete queue emptiness check
From: Alexander Usyskin <alexander.usyskin@...el.com>
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 <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
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
Powered by blists - more mailing lists