Re: [PATCH/RFC 3/5] usb:g_zero: bulk in/out unittest support

Felipe Balbi
2011-06-16T16:25:46Z

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Hi,

On Thu, Jun 16, 2011 at 04:31:05PM +0300, Tatyana Brokhman wrote:
> This commit adds a new vendor specific request to be handled by the
> g_zero module in it's sourcesink configuration. The purpose if this
> request is to update the length of the BULK transfer to a given value.
> The bRequest value of the new control request is 0x5e.
> It is used by the user-space Unit testing application for bulk in/out
> tests.
>
> Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
>
> ---
> drivers/usb/gadget/f_sourcesink.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
> index caf2f95..d417b8a 100644
> --- a/drivers/usb/gadget/f_sourcesink.c
> +++ b/drivers/usb/gadget/f_sourcesink.c
> @@ -70,6 +70,7 @@ static unsigned pattern;
> module_param(pattern, uint, 0);
> MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63 ");
>
> +static struct f_sourcesink *the_sourcesink;

this is a big no-no. f_*.c should always be able to be instantiated as
many times as we need.

> /*-------------------------------------------------------------------------*/
>
> static struct usb_interface_descriptor source_sink_intf = {
> @@ -197,6 +198,7 @@ static void
> sourcesink_unbind(struct usb_configuration *c, struct usb_function *f)
> {
> kfree(func_to_ss(f));
> + the_sourcesink = NULL;
> }
>
> /* optionally require specific source/sink data patterns */
> @@ -425,6 +427,7 @@ static int __init sourcesink_bind_config(struct usb_configuration *c)
> status = usb_add_function(c, &ss->function);
> if (status)
> kfree(ss);
> + the_sourcesink = ss;
> return status;
> }
>
> @@ -472,6 +475,15 @@ static int sourcesink_setup(struct usb_configuration *c,
> value = w_length;
> break;
>
> + case 0x5e:
> + /*
> + * Change bulk ep buffer size. buflen is the length of
> + * the BULK transfer (req->length=buflen). Defined in g_zero.h
> + */
> + disable_source_sink(the_sourcesink);
> + buflen = w_value;
> + value = enable_source_sink(c->cdev, the_sourcesink);
> + break;
> default:

I think this request, should be handled by the f_sourcesink interface.
Meaning you'd need to introduce another f_sourcesink_setup(); to be
added to the function, rather then the configuration.

Please change that.

--
balbi

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