USB: introduce usb_device_no_sg_constraint() helper

Some host controllers(such as xHCI) can support building
packet from discontinuous buffers, so introduce one flag
and helper for this kind of host controllers, then the
feature can help some applications(such as usbnet) by
supporting arbitrary length of sg buffers.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 4e7a311ff6d723ee44ed46ebd97b5e32f5c3b47e..c12bc790a6a702de065087b9d4c07563f3bb54b1 100644 (file)
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -416,7 +416,8 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
                        urb->iso_frame_desc[n].status = -EXDEV;
                        urb->iso_frame_desc[n].actual_length = 0;
                }
-       } else if (dev->speed != USB_SPEED_WIRELESS && urb->num_sgs) {
+       } else if (urb->num_sgs && !urb->dev->bus->no_sg_constraint &&
+                       dev->speed != USB_SPEED_WIRELESS) {
                struct scatterlist *sg;
                int i;
 

diff --git a/include/linux/usb.h b/include/linux/usb.h
index acb1b0aa77d85fdbdf83031bde45896ae9024f61..001629cd1a97b831f2eb448013c114b3a76f0de7 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -337,6 +337,7 @@ struct usb_bus {
                                         * the ep queue on a short transfer
                                         * with the URB_SHORT_NOT_OK flag set.
                                         */
+       unsigned no_sg_constraint:1;    /* no sg constraint */
        unsigned sg_tablesize;          /* 0 or largest number of sg list entries */
 
        int devnum_next;                /* Next open device number in
@@ -684,6 +685,11 @@ static inline bool usb_device_supports_ltm(struct usb_device *udev)
        return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
 }
 
+static inline bool usb_device_no_sg_constraint(struct usb_device *udev)
+{
+       return udev && udev->bus && udev->bus->no_sg_constraint;
+}
+
 
 /*-------------------------------------------------------------------------*/
 
@@ -1253,7 +1259,7 @@ typedef void (*usb_complete_t)(struct urb *);
  *     transfer_buffer.
  * @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
+ *     max packet size if no_sg_constraint isn't set in 'struct usb_bus'
  * @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