linux-kernel - [PATCH] Input: evdev - add a schedule point in evdev

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Message-ID: <20181005005359.GA218372@dtor-ws>
Date:   Thu, 4 Oct 2018 17:53:59 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     linux-input@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/input/evdev.c | 1 +
 1 file changed, 1 insertion(+)

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:
-- 
2.19.0.605.g01d371f741-goog


-- 
Dmitry