USB: whci-hcd: make endpoint_reset method async

usb_hcd_endpoint_reset() may be called in atomic context and must not
sleep.  So make whci-hcd's endpoint_reset() asynchronous.  URBs
submitted while the reset is in progress will be queued (on the std
list) and transfers will resume once the reset is complete.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/usb/host/whci/hcd.c b/drivers/usb/host/whci/hcd.c
index e019a5058ab8..687b622a1612 100644
--- a/drivers/usb/host/whci/hcd.c
+++ b/drivers/usb/host/whci/hcd.c
@@ -192,19 +192,23 @@ static void whc_endpoint_reset(struct usb_hcd *usb_hcd,
         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
         struct whc *whc = wusbhc_to_whc(wusbhc);
         struct whc_qset *qset;
+        unsigned long flags;
+
+        spin_lock_irqsave(&whc->lock, flags);
 
         qset = ep->hcpriv;
         if (qset) {
                 qset->remove = 1;
+                qset->reset = 1;
 
                 if (usb_endpoint_xfer_bulk(&ep->desc)
                     || usb_endpoint_xfer_control(&ep->desc))
                         queue_work(whc->workqueue, &whc->async_work);
                 else
                         queue_work(whc->workqueue, &whc->periodic_work);
-
-                qset_reset(whc, qset);
         }
+
+        spin_unlock_irqrestore(&whc->lock, flags);
 }