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

Signed-off-by: Dima Zavin <dima@android.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 03344b3c7c1..a9d871651ce 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -412,6 +412,9 @@ static ssize_t evdev_read(struct file *file, char __user *buffer,
                 retval += input_event_size();
         }
 
+        if (retval == 0 && (file->f_flags & O_NONBLOCK))
+                return -EAGAIN;
+
         return retval;
 }