Re: [Qemu-devel] [PATCH] usb-host: handle guest-issued clear halt

[Erik Rull <erik.rull@rdsoftware.de>]

 Looks VERY good, ACK!
The DVD drive works now!


On May 8, 2012 at 2:06 PM Gerd Hoffmann <kraxel@redhat.com> wrote:

> Most important here is to update our internal endpoint state so we know
> the endpoint isn't in halted state any more.  Without this usb-host
> tries to clear halt again with the next data transfer submitted.  Doing
> this twice is (a) not correct and (b) confuses some usb devices,
> rendering them non-functional in the guest.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/usb/host-linux.c |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/hw/usb/host-linux.c b/hw/usb/host-linux.c
> index bb08542..9094120 100644
> --- a/hw/usb/host-linux.c
> +++ b/hw/usb/host-linux.c
> @@ -1101,6 +1101,15 @@ static int usb_host_handle_control(USBDevice *dev,
USBPacket *p,
>          ret = usb_host_set_interface(s, index, value);
>          trace_usb_host_req_emulated(s->bus_num, s->addr, p, ret);
>          return ret;
> +
> +    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
> +        if (value == 0) { /* clear halt */
> +            int pid = (index & USB_DIR_IN) ? USB_TOKEN_IN :
USB_TOKEN_OUT;
> +            ioctl(s->fd, USBDEVFS_CLEAR_HALT, &index);
> +            clear_halt(s, pid, index & 0x0f);
> +            trace_usb_host_req_emulated(s->bus_num, s->addr, p, 0);
> +            return 0;
> +        }
>      }
> 
>      /* The rest are asynchronous */
> --
> 1.7.1
>
>