linux-kernel - [PATCH 3.12 053/127] dib0700: fix nec repeat handling

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Date:   Fri, 25 Nov 2016 09:29:26 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Sean Young <sean@...s.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 053/127] dib0700: fix nec repeat handling

From: Sean Young <sean@...s.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit ba13e98f2cebd55a3744c5ffaa08f9dca73bf521 upstream.

When receiving a nec repeat, ensure the correct scancode is repeated
rather than a random value from the stack.  This removes the need for
the bogus uninitialized_var() and also fixes the warnings:

    drivers/media/usb/dvb-usb/dib0700_core.c: In function ‘dib0700_rc_urb_completion’:
    drivers/media/usb/dvb-usb/dib0700_core.c:679: warning: ‘protocol’ may be used uninitialized in this function

[sean addon: So after writing the patch and submitting it, I've bought the
             hardware on ebay. Without this patch you get random scancodes
             on nec repeats, which the patch indeed fixes.]

Signed-off-by: Sean Young <sean@...s.org>
Tested-by: Sean Young <sean@...s.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/media/usb/dvb-usb/dib0700_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index bf2a908d74cf..452ef7bc630c 100644
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -674,7 +674,7 @@ static void dib0700_rc_urb_completion(struct urb *purb)
 {
 	struct dvb_usb_device *d = purb->context;
 	struct dib0700_rc_response *poll_reply;
-	u32 uninitialized_var(keycode);
+	u32 keycode;
 	u8 toggle;
 
 	deb_info("%s()\n", __func__);
@@ -713,7 +713,8 @@ static void dib0700_rc_urb_completion(struct urb *purb)
 		if ((poll_reply->system == 0x00) && (poll_reply->data == 0x00)
 		    && (poll_reply->not_data == 0xff)) {
 			poll_reply->data_state = 2;
-			break;
+			rc_repeat(d->rc_dev);
+			goto resubmit;
 		}
 
 		if ((poll_reply->system ^ poll_reply->not_system) != 0xff) {
-- 
2.10.2