USB: dummy-hcd: disable interrupts during req->complete

This patch (as756) fixes a bug in dummy-hcd found by the lockdep
checker.  In one of the code paths, the driver did not disable
interrupts before calling a request completion routine.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 4be47195bd38..7d1c22c34957 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -609,7 +609,8 @@ static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
         if (!dum->driver)
                 return -ESHUTDOWN;
 
-        spin_lock_irqsave (&dum->lock, flags);
+        local_irq_save (flags);
+        spin_lock (&dum->lock);
         list_for_each_entry (req, &ep->queue, queue) {
                 if (&req->req == _req) {
                         list_del_init (&req->queue);
@@ -618,7 +619,7 @@ static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
                         break;
                 }
         }
-        spin_unlock_irqrestore (&dum->lock, flags);
+        spin_unlock (&dum->lock);
 
         if (retval == 0) {
                 dev_dbg (udc_dev(dum),
@@ -626,6 +627,7 @@ static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
                                 req, _ep->name, _req->length, _req->buf);
                 _req->complete (_ep, _req);
         }
+        local_irq_restore (flags);
         return retval;
 }