On Thu, Nov 29, 2018 at 10:30:15PM +0000, Malcolm Priestley wrote:
> Interrupt is always present throught life time of
> there is no dma element move this buffer to private
> area of driver.
>
> Signed-off-by: Malcolm Priestley <tvbox...@gmail.com>
> ---
> drivers/media/usb/dvb-usb-v2/lmedm04.c | 26 +++++++++-----------------
> 1 file changed, 9 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/media/usb/dvb-usb-v2/lmedm04.c
> b/drivers/media/usb/dvb-usb-v2/lmedm04.c
> index 8fb53b83c914..7b1aaed259db 100644
> --- a/drivers/media/usb/dvb-usb-v2/lmedm04.c
> +++ b/drivers/media/usb/dvb-usb-v2/lmedm04.c
> @@ -134,7 +134,7 @@ struct lme2510_state {
> u8 stream_on;
> u8 pid_size;
> u8 pid_off;
> - void *buffer;
> + u8 int_buffer[128];
> struct urb *lme_urb;
> u8 usb_buffer[64];
> /* Frontend original calls */
> @@ -408,20 +408,14 @@ static int lme2510_int_read(struct dvb_usb_adapter
> *adap)
> if (lme_int->lme_urb == NULL)
> return -ENOMEM;
>
> - lme_int->buffer = usb_alloc_coherent(d->udev, 128, GFP_ATOMIC,
> - &lme_int->lme_urb->transfer_dma);
> -
The buffer was allocated with usb_alloc_coherent, however now it is
allocated with kmalloc.
> - if (lme_int->buffer == NULL)
> - return -ENOMEM;
> -
> usb_fill_int_urb(lme_int->lme_urb,
> - d->udev,
> - usb_rcvintpipe(d->udev, 0xa),
> - lme_int->buffer,
> - 128,
> - lme2510_int_response,
> - adap,
> - 8);
> + d->udev,
> + usb_rcvintpipe(d->udev, 0xa),
> + lme_int->int_buffer,
> + sizeof(lme_int->int_buffer),
> + lme2510_int_response,
> + adap,
> + 8);
>
> /* Quirk of pipe reporting PIPE_BULK but behaves as interrupt */
> ep = usb_pipe_endpoint(d->udev, lme_int->lme_urb->pipe);
On line 408:
lme_int->lme_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
This requires usb_alloc_coherent().
> @@ -1245,11 +1239,9 @@ static void lme2510_exit(struct dvb_usb_device *d)
> lme2510_kill_urb(&adap->stream);
> }
>
> - if (st->lme_urb != NULL) {
> + if (st->lme_urb) {
> usb_kill_urb(st->lme_urb);
> usb_free_urb(st->lme_urb);
> - usb_free_coherent(d->udev, 128, st->buffer,
> - st->lme_urb->transfer_dma);
> info("Interrupt Service Stopped");
> }
> }
> --
> 2.19.1
