Input: mousedev - signal that device is writable in mousedev_poll()

The Microsoft ImPS/2 mouse protocol being bidirectionnal (sic)
one may have to write in /dev/input/mice; and that works better
if select() does not hang.

Signed-off-by: Julien Moutinho <julm+linux@savines.alpes.fr.eu.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index d7a7a2fce745..d8f68f77007b 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -765,10 +765,15 @@ static unsigned int mousedev_poll(struct file *file, poll_table *wait)
 {
         struct mousedev_client *client = file->private_data;
         struct mousedev *mousedev = client->mousedev;
+        unsigned int mask;
 
         poll_wait(file, &mousedev->wait, wait);
-        return ((client->ready || client->buffer) ? (POLLIN | POLLRDNORM) : 0) |
-                (mousedev->exist ? 0 : (POLLHUP | POLLERR));
+
+        mask = mousedev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
+        if (client->ready || client->buffer)
+                mask |= POLLIN | POLLRDNORM;
+
+        return mask;
 }
 
 static const struct file_operations mousedev_fops = {