In working on a project (http://github.com/dominicgs/USBProxy) we ran
across an issue where io on endpoint 0 would cause the system to hang.
We made the following change which resolved the problem for us. I'm
not sure if this is the "correct" fix, or if the problem is specific
to our platform BeagleBone Black with a musb-hrdc controller.
--- inode.c 2013-11-18 14:46:25.255029000 -0500
+++ inode.c2 2013-11-19 06:30:36.579029000 -0500
@@ -679,7 +679,9 @@
req->length = len;
req->complete = ep_aio_complete;
req->context = iocb;
+ spin_unlock_irq(&epdata->dev->lock);
value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
+ spin_lock_irq(&epdata->dev->lock);
if (unlikely(0 != value))
usb_ep_free_request(epdata->ep, req);
} else
@@ -1012,8 +1014,11 @@
struct usb_ep *ep = dev->gadget->ep0;
struct usb_request *req = dev->req;
- if ((retval = setup_req (ep, req, 0)) == 0)
+ if ((retval = setup_req (ep, req, 0)) == 0) {
+ spin_unlock_irq (&dev->lock);
retval = usb_ep_queue (ep, req, GFP_ATOMIC);
+ spin_lock_irq (&dev->lock);
+ }
dev->state = STATE_DEV_CONNECTED;
/* assume that was SET_CONFIGURATION */
--
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