USB: add reset endpoint operations

Wireless USB endpoint state has a sequence number and a current
window and not just a single toggle bit.  So allow HCDs to provide a
endpoint_reset method and call this or clear the software toggles as
required (after a clear halt, set configuration etc.).

usb_settoggle() and friends are then HCD internal and are moved into
core/hcd.h and all device drivers call usb_reset_endpoint() instead.

If the device endpoint state has been reset (with a clear halt) but
the host endpoint state has not then subsequent data transfers will
not complete. The device will only work again after it is reset or
disconnected.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 11 deletions

diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 69b7f8e77596..689cd27ac890 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -1025,6 +1025,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 {
 	struct urb *urb = &sc->work_urb;
 	struct bulk_cs_wrap *bcs;
+	int endp;
 	int len;
 	int rc;
 
@@ -1033,6 +1034,10 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 		return;
 	}
 
+	endp = usb_pipeendpoint(sc->last_pipe);
+	if (usb_pipein(sc->last_pipe))
+		endp |= USB_DIR_IN;
+
 	if (cmd->state == UB_CMDST_CLEAR) {
 		if (urb->status == -EPIPE) {
 			/*
@@ -1048,9 +1053,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 		 * We ignore the result for the halt clear.
 		 */
 
-		/* reset the endpoint toggle */
-		usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
-			usb_pipeout(sc->last_pipe), 0);
+		usb_reset_endpoint(sc->dev, endp);
 
 		ub_state_sense(sc, cmd);
 
@@ -1065,9 +1068,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 		 * We ignore the result for the halt clear.
 		 */
 
-		/* reset the endpoint toggle */
-		usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
-			usb_pipeout(sc->last_pipe), 0);
+		usb_reset_endpoint(sc->dev, endp);
 
 		ub_state_stat(sc, cmd);
 
@@ -1082,9 +1083,7 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
 		 * We ignore the result for the halt clear.
 		 */
 
-		/* reset the endpoint toggle */
-		usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
-			usb_pipeout(sc->last_pipe), 0);
+		usb_reset_endpoint(sc->dev, endp);
 
 		ub_state_stat_counted(sc, cmd);
 
@@ -2119,8 +2118,7 @@ static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe)
 	del_timer_sync(&timer);
 	usb_kill_urb(&sc->work_urb);
 
-	/* reset the endpoint toggle */
-	usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0);
+	usb_reset_endpoint(sc->dev, endp);
 
 	return 0;
 }