diff options
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 0eec268..6efdab0 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1247,7 +1247,9 @@ typedef void (*usb_complete_t)(struct urb *); * the device driver is saying that it provided this DMA address, * which the host controller driver should use in preference to the * transfer_buffer. - * @sg: scatter gather buffer list + * @sg: scatter gather buffer list, the buffer size of each element in + * the list (except the last) must be divisible by the endpoint's + * max packet size * @num_mapped_sgs: (internal) number of mapped sg entries * @num_sgs: number of entries in the sg list * @transfer_buffer_length: How big is transfer_buffer. The transfer may @@ -1534,10 +1536,16 @@ static inline void usb_fill_int_urb(struct urb *urb, urb->transfer_buffer_length = buffer_length; urb->complete = complete_fn; urb->context = context; - if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) + + if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER) { + /* make sure interval is within allowed range */ + interval = clamp(interval, 1, 16); + urb->interval = 1 << (interval - 1); - else + } else { urb->interval = interval; + } + urb->start_frame = -1; } |
