From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Fri, 5 Oct 2018 00:45:54 +0000 (-0700)
Subject: Input: evdev - add a schedule point in evdev_write()
X-Git-Tag: v4.19-rc8~20^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=36d2582ff235b4e01ad64a734c877a52dc762d9c;p=linux.git

Input: evdev - add a schedule point in evdev_write()

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>
---

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 370206f987f9..f48369d6f3a0 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: