[PATCH] USB: fix to synchronous API regarding memory allocation

some part of the synchronous API is used in the block io error handling
code paths. Therefore it may use only GFP_NOIO, not GFP_KERNEL.
  - avoid deadlock due to wrong memory allocation in block io path

drivers/usb/core/message.c

@@ -88,7 +88,7 @@ int usb_internal_control_msg(struct usb_device *usb_dev, unsigned int pipe,
 	int retv;
 	int length;
 
-	urb = usb_alloc_urb(0, GFP_KERNEL);
+	urb = usb_alloc_urb(0, GFP_NOIO);
 	if (!urb)
 		return -ENOMEM;
   
@@ -131,7 +131,7 @@ int usb_internal_control_msg(struct usb_device *usb_dev, unsigned int pipe,
 int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype,
 			 __u16 value, __u16 index, void *data, __u16 size, int timeout)
 {
-	struct usb_ctrlrequest *dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
+	struct usb_ctrlrequest *dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
 	int ret;
 	
 	if (!dr)