[Oneiric/Precise SRU][PATCH] UBUNTU: SAUCE: usb: cdc-wdm: fix regression on buffer deallocation

[Ming Lei]

On Fri, Dec 14, 2012 at 9:12 PM, Herton Ronaldo Krzesinski
<herton.krzesinski at canonical.com> wrote:
> Commit cafbe85 ("USB: cdc-wdm: better allocate a buffer that is at least
> as big as we tell the USB core") introduced a regression: it changed
> the size used in usb_alloc_coherent, but failed to do the same for the
> usb_free_coherent calls.
>
> It also was marked for stable and got backported to older kernels. But

Every stable tree which has merged the commit should be fixed by the patch too.

> in the upstream kernel, the usage of usb_alloc_coherent was right after
> removed from the driver, so upstream doesn't have this problem, while
> the stable kernels still have. For now, just fix the usb_free_coherent
> calls to match the usb_alloc_coherent change.
>
> BugLink: https://bugs.launchpad.net/bugs/1074157
> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>

Acked-by: Ming Lei <ming.lei at canonical.com>

> ---
>  drivers/usb/class/cdc-wdm.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
> index 9aaed0d..97b2c55 100644
> --- a/drivers/usb/class/cdc-wdm.c
> +++ b/drivers/usb/class/cdc-wdm.c
> @@ -301,7 +301,7 @@ static void cleanup(struct wdm_device *desc)
>                           desc->sbuf,
>                           desc->validity->transfer_dma);
>         usb_free_coherent(interface_to_usbdev(desc->intf),
> -                         desc->bMaxPacketSize0,
> +                         desc->wMaxCommand,
>                           desc->inbuf,
>                           desc->response->transfer_dma);
>         kfree(desc->orq);
> @@ -788,7 +788,7 @@ out:
>  err3:
>         usb_set_intfdata(intf, NULL);
>         usb_free_coherent(interface_to_usbdev(desc->intf),
> -                         desc->bMaxPacketSize0,
> +                         desc->wMaxCommand,
>                         desc->inbuf,
>                         desc->response->transfer_dma);
>  err2:
> --
> 1.7.9.5
>