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

dtor · dtor · commit 36d2582ff235 · 2018-10-05T11:42:31.000-07:00
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 &lt;paulmck@linux.ibm.com&gt;
Signed-off-by: Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;
diff --git 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:

Original file line number	Diff line number	Diff line change
`@@ -564,6 +564,7 @@ static ssize_t evdev_write(struct file file, const char __user buffer,`
`564`	`564`
`565`	`565`	`input_inject_event(&evdev->handle,`
`566`	`566`	`event.type, event.code, event.value);`
	`567`	`+ cond_resched();`
`567`	`568`	`}`
`568`	`569`
`569`	`570`	`out:`