HID: uhid: Fix returning EPOLLOUT from uhid_char_poll
commit be54e7461ffdc5809b67d2aeefc1ddc9a91470c7 upstream.
Always return EPOLLOUT from uhid_char_poll to allow polling /dev/uhid
for writable state.
Fixes: 1f9dec1e0164 ("HID: uhid: allow poll()'ing on uhid devices")
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index d02ee53..d9b46da 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -26,6 +26,7 @@
#include <linux/uhid.h>
#include <linux/wait.h>
#include <linux/uaccess.h>
+#include <linux/eventpoll.h>
#define UHID_NAME "uhid"
#define UHID_BUFSIZE 32
@@ -774,7 +775,7 @@
if (uhid->head != uhid->tail)
return POLLIN | POLLRDNORM;
- return 0;
+ return EPOLLOUT | EPOLLWRNORM;
}
static const struct file_operations uhid_fops = {