diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 612dbdfa388ed29db4620149954b7ee46603d393..3cc93237ff98714cbe8cc18fbbc16dff1e382793 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -417,9 +417,21 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) #define gadget_for_each_ep(tmp, gadget) \ 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 ? usb_ep_align(ep, len) : len; } /**