USB: usbfs: export the URB_NO_INTERRUPT flag to userspace

This patch (as1079) cleans up the way URB_* flags are exported in
usbfs.

	The URB_NO_INTERRUPT flag is now exported (this is the
	only behavioral change).

	USBDEVFS_URB_* macros are added for URB_NO_FSBR,
	URB_ZERO_PACKET, and URB_NO_INTERRUPT, making explicit the
	fact that the kernel accepts them.

	The flag matching takes into account that the URB_* values
	may change as the kernel evolves, whereas the USBDEVFS_URB_*
	values must remain fixed since they are a user API.

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

1 files changed, 23 insertions, 4 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 039ba23cc8b6..6c4cd82d7d14 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -948,8 +948,11 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
         int ret, ifnum = -1;
         int is_in;
 
-        if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
-                           URB_NO_FSBR|URB_ZERO_PACKET))
+        if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
+                                USBDEVFS_URB_SHORT_NOT_OK |
+                                USBDEVFS_URB_NO_FSBR |
+                                USBDEVFS_URB_ZERO_PACKET |
+                                USBDEVFS_URB_NO_INTERRUPT))
                 return -EINVAL;
         if (!uurb->buffer)
                 return -EINVAL;
@@ -1104,8 +1107,24 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
         as->urb->pipe = (uurb->type << 30) |
                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
                         (uurb->endpoint & USB_DIR_IN);
-        as->urb->transfer_flags = uurb->flags |
-                        (is_in ? URB_DIR_IN : URB_DIR_OUT);
+
+        /* This tedious sequence is necessary because the URB_* flags
+         * are internal to the kernel and subject to change, whereas
+         * the USBDEVFS_URB_* flags are a user API and must not be changed.
+         */
+        u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
+        if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
+                u |= URB_ISO_ASAP;
+        if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
+                u |= URB_SHORT_NOT_OK;
+        if (uurb->flags & USBDEVFS_URB_NO_FSBR)
+                u |= URB_NO_FSBR;
+        if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
+                u |= URB_ZERO_PACKET;
+        if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
+                u |= URB_NO_INTERRUPT;
+        as->urb->transfer_flags = u;
+
         as->urb->transfer_buffer_length = uurb->buffer_length;
         as->urb->setup_packet = (unsigned char *)dr;
         as->urb->start_frame = uurb->start_frame;