Merge branch 'clockevents/fixes' of git://git.linaro.org/people/daniel.lezcano/linux...

[linux-drm-fsl-dcu.git] / include / linux / usb.h

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 7454865ad14834f50a05dc9baf7f6d78ea3de7b8..512ab162832ccc0bb4b30f6210d083d762573b78 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1264,6 +1264,8 @@ typedef void (*usb_complete_t)(struct urb *);
  * @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 if no_sg_constraint isn't set in 'struct usb_bus'
+ *     (FIXME: scatter-gather under xHCI is broken for periodic transfers.
+ *     Do not use urb->sg for interrupt endpoints for now, only bulk.)
  * @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