diff options
Diffstat (limited to 'drivers/media/usb/dvb-usb-v2/rtl28xxu.c')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/rtl28xxu.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c index 5a503a6bb8c5..89d474998e3e 100644 --- a/drivers/media/usb/dvb-usb-v2/rtl28xxu.c +++ b/drivers/media/usb/dvb-usb-v2/rtl28xxu.c @@ -50,7 +50,16 @@ static int rtl28xxu_ctrl_msg(struct dvb_usb_device *d, struct rtl28xxu_req *req) } else { /* read */ requesttype = (USB_TYPE_VENDOR | USB_DIR_IN); - pipe = usb_rcvctrlpipe(d->udev, 0); + + /* + * Zero-length transfers must use usb_sndctrlpipe() and + * rtl28xxu_identify_state() uses a zero-length i2c read + * command to determine the chip type. + */ + if (req->size) + pipe = usb_rcvctrlpipe(d->udev, 0); + else + pipe = usb_sndctrlpipe(d->udev, 0); } ret = usb_control_msg(d->udev, pipe, 0, requesttype, req->value, |