Hi Michal, On 27/07/16 20:37, Michal Nazarewicz wrote: > On Tue, Jul 26 2016, Felipe F. Tonello wrote: >> USB spec specifies wMaxPacketSize to be little endian (as other properties), >> so when using this variable in the driver we should convert to the current >> CPU endianness if necessary. >> >> This patch also introduces usb_ep_align() which does always returns the >> aligned buffer size for an endpoint. This is useful to be used by USB requests >> allocator functions. >> >> Signed-off-by: Felipe F. Tonello <eu@xxxxxxxxxxxxxxxxx> > > Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx> > >> --- >> include/linux/usb/gadget.h | 17 ++++++++++++++--- >> 1 file changed, 14 insertions(+), 3 deletions(-) >> >> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h >> index 612dbdfa388e..b8fa6901b881 100644 >> --- a/include/linux/usb/gadget.h >> +++ b/include/linux/usb/gadget.h >> @@ -418,8 +418,20 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) >> list_for_each_entry(tmp, &(gadget)->ep_list, ep_list) >> >> /** >> + * usb_ep_align - returns @len aligned to ep's maxpacketsize. >> + * @ep: the endpoint whose maxpacketsize is used to align @len >> + * @len: buffer size's length to align to @ep's maxpacketsize >> + * >> + * This helper is used to align buffer's size to an ep's maxpacketsize. >> + */ >> +static inline size_t usb_ep_align(struct usb_ep *ep, size_t len) >> +{ >> + return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize)); >> +} >> + >> +/** >> * usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget >> - * requires quirk_ep_out_aligned_size, otherwise reguens len. >> + * requires quirk_ep_out_aligned_size, otherwise returns len. >> * @g: controller to check for quirk >> * @ep: the endpoint whose maxpacketsize is used to align @len >> * @len: buffer size's length to align to @ep's maxpacketsize >> @@ -430,8 +442,7 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) >> static inline size_t >> usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len) >> { >> - return !g->quirk_ep_out_aligned_size ? len : >> - round_up(len, (size_t)ep->desc->wMaxPacketSize); >> + return !g->quirk_ep_out_aligned_size ? len : usb_ep_align(ep, len); > > I’d drop the negation: > > + return g->quirk_ep_out_aligned_size ? usb_ep_align(ep, len) : len; Agreed. > >> } >> >> /** >> -- >> 2.9.0 >> > -- Felipe
Attachment:
0x92698E6A.asc
Description: application/pgp-keys