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SubjectRe: [PATCH] usb: gadget: f_midi: Add checking if it need align buffer's size to an ep's maxpacketsize
Date
On Thu, Jul 07 2016, Baolin Wang wrote:
> Some gadget device (such as dwc3 gadget) requires quirk_ep_out_aligned_size
> attribute, which means it need to align the request buffer's size to an ep's
> maxpacketsize.
>
> Thus we add usb_ep_align_maybe() function to check if it is need to align
> the request buffer's size to an ep's maxpacketsize.
>
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

Acked-by: Michal Nazarewicz <mina86@mina86.com>

> ---
> drivers/usb/gadget/function/f_midi.c | 18 +++++++++++-------
> 1 file changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index 58fc199..2e3f11e 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -328,7 +328,7 @@ static int f_midi_start_ep(struct f_midi *midi,
> static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
> {
> struct f_midi *midi = func_to_midi(f);
> - unsigned i;
> + unsigned i, length;
> int err;
>
> /* we only set alt for MIDIStreaming interface */
> @@ -345,9 +345,11 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>
> /* pre-allocate write usb requests to use on f_midi_transmit. */
> while (kfifo_avail(&midi->in_req_fifo)) {
> - struct usb_request *req =
> - midi_alloc_ep_req(midi->in_ep, midi->buflen);
> + struct usb_request *req;
>
> + length = usb_ep_align_maybe(midi->gadget, midi->in_ep,
> + midi->buflen);
> + req = midi_alloc_ep_req(midi->in_ep, length);
> if (req == NULL)
> return -ENOMEM;
>
> @@ -359,10 +361,12 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>
> /* allocate a bunch of read buffers and queue them all at once. */
> for (i = 0; i < midi->qlen && err == 0; i++) {
> - struct usb_request *req =
> - midi_alloc_ep_req(midi->out_ep,
> - max_t(unsigned, midi->buflen,
> - bulk_out_desc.wMaxPacketSize));
> + struct usb_request *req;
> +
> + length = usb_ep_align_maybe(midi->gadget, midi->out_ep,
> + midi->buflen);
> + req = midi_alloc_ep_req(midi->out_ep,
> + max_t(unsigned, length, bulk_out_desc.wMaxPacketSize));

Perhaps:

+ length = midi->buflen < bulk_out_desc.wMaxPacketSize
+ ? bulk_out_desc.wMaxPacketSize
+ : usb_ep_align_maybe(midi->gadget, midi->out_ep,
+ midi->buflen);
+ req = midi_alloc_ep_req(midi->out_ep, length);

I find it somewhat cleaner. Up to you.

> if (req == NULL)
> return -ENOMEM;
>

--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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