[PATCH AUTOSEL 4.18 08/27] Input: evdev - add a schedule point in evdev_write()

Sasha Levin
2018-10-22T10:19:47Z

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

[ Upstream commit 36d2582ff235b4e01ad64a734c877a52dc762d9c ]

Large writes to evdev interface may cause rcu stalls. Let's add
cond_resched() to the loop to avoid this.

Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/evdev.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index c81c79d01d93..718d5622267d 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -564,6 +564,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer,

input_inject_event(&evdev->handle,
event.type, event.code, event.value);
+ cond_resched();
}

out:
--
2.17.1