USB: set the correct interval for interrupt URBs

This patch (as862) fixes a couple of bugs in the way usbcore handles
intervals for interrupt URBs.  usb_interrupt_msg (and usb_bulk_msg for
backward compatibility) don't set the interval correctly for
high-speed devices.  proc_do_submiturb() doesn't set it correctly when
a bulk URB is submitted to an interrupt endpoint.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 274f14f1633..36e7a843bf9 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -912,7 +912,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
         struct async *as;
         struct usb_ctrlrequest *dr = NULL;
         unsigned int u, totlen, isofrmlen;
-        int ret, interval = 0, ifnum = -1;
+        int ret, ifnum = -1;
 
         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
                            URB_NO_FSBR|URB_ZERO_PACKET))
@@ -992,7 +992,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
                                 != USB_ENDPOINT_XFER_ISOC)
                         return -EINVAL;
-                interval = 1 << min (15, ep->desc.bInterval - 1);
                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
                         return -ENOMEM;
@@ -1021,10 +1020,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
                                 != USB_ENDPOINT_XFER_INT)
                         return -EINVAL;
-                if (ps->dev->speed == USB_SPEED_HIGH)
-                        interval = 1 << min (15, ep->desc.bInterval - 1);
-                else
-                        interval = ep->desc.bInterval;
                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
                         return -EINVAL;
                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
@@ -1053,7 +1048,11 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
         as->urb->setup_packet = (unsigned char*)dr;
         as->urb->start_frame = uurb->start_frame;
         as->urb->number_of_packets = uurb->number_of_packets;
-        as->urb->interval = interval;
+        if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
+                        ps->dev->speed == USB_SPEED_HIGH)
+                as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
+        else
+                as->urb->interval = ep->desc.bInterval;
         as->urb->context = as;
         as->urb->complete = async_completed;
         for (totlen = u = 0; u < uurb->number_of_packets; u++) {