From: Dima Zavin <dima@android.com>
Date: Wed, 5 Oct 2011 05:31:48 +0000 (-0700)
Subject: input: evdev: if no events and non-block, return EAGAIN not 0
X-Git-Tag: firefly_0821_release~7613^2~279
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=587b1eb1629612189c8b278d4efee952bcf73b4f;p=firefly-linux-kernel-4.4.55.git

input: evdev: if no events and non-block, return EAGAIN not 0

Change-Id: I5f0da721f74e5de111cffc7e7b375b72dd80e530
Signed-off-by: Dima Zavin <dima@android.com>
---

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 13a741ae6045..10ae1c966a35 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -426,6 +426,8 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
 		retval += input_event_size();
 	}
 
+	if (retval == 0 && file->f_flags & O_NONBLOCK)
+		retval = -EAGAIN;
 	return retval;
 }