linux-kernel - [PATCH AUTOSEL 3.18 2/4] Input: evdev - add a schedule point in evdev

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Message-Id: <20181022102255.41695-2-sashal@kernel.org>
Date:   Mon, 22 Oct 2018 06:22:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 3.18 2/4] Input: evdev - add a schedule point in evdev_write()

From: Dmitry Torokhov <dmitry.torokhov@...il.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@...ux.ibm.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/input/evdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 928dec311c2b..6e054aae1f50 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -450,6 +450,7 @@ 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