[media] mceusb: sporadic RX truncation corruption fix

Intermittent RX truncation and loss of IR received data. This resulted
in receive stream synchronization errors where driver attempted to
incorrectly parse IR data (eg 0x90 below) as command response.

[ 3969.139898] mceusb 1-1.2:1.0: processed IR data
[ 3969.151315] mceusb 1-1.2:1.0: rx data: 00 90 (length=2)
[ 3969.151321] mceusb 1-1.2:1.0: Unknown command 0x00 0x90
[ 3969.151336] mceusb 1-1.2:1.0: rx data: 98 0a 8d 0a 8e 0a 8e 0a 8e 0a 8e 0a 9a 0a 8e 0a 0b 3a 8e 00 80 41 59 00 00 (length=25)
[ 3969.151341] mceusb 1-1.2:1.0: Raw IR data, 24 pulse/space samples
[ 3969.151348] mceusb 1-1.2:1.0: Storing space with duration 500000

Bug trigger appears to be normal, but heavy, IR receiver use.

Signed-off-by: A Sun <as1033x@comcast.net>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index 93b16fe..e05fed2 100644 (file)
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1337,8 +1337,13 @@ static int mceusb_dev_probe(struct usb_interface *intf,
                goto rc_dev_fail;
 
        /* wire up inbound data handler */
-       usb_fill_int_urb(ir->urb_in, dev, pipe, ir->buf_in, maxp,
-                               mceusb_dev_recv, ir, ep_in->bInterval);
+       if (usb_endpoint_xfer_int(ep_in))
+               usb_fill_int_urb(ir->urb_in, dev, pipe, ir->buf_in, maxp,
+                                mceusb_dev_recv, ir, ep_in->bInterval);
+       else
+               usb_fill_bulk_urb(ir->urb_in, dev, pipe, ir->buf_in, maxp,
+                                 mceusb_dev_recv, ir);
+
        ir->urb_in->transfer_dma = ir->dma_in;
        ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;