Merge tag 'fixes-for-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-linus

Felipe writes:

usb: fixes for v4.14-rc2

First set of fixes for the gadget side. Not much this time around,
things have been rather calm.

In no order whatsoever, this pull request contains:

- A DMA starvation fix on dwc3 caused by some recent changes to how we
  map/unmap requests

- A build error fix on the snps_udc_plat.c driver

- A fix for how to we call ->udc_set_speed()

- Spinlock recursion fix on the printer gadget

- Removal of pointless comparisons on dummy driver

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index 8df244fc9d80..ea0da35a44e2 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -555,6 +555,7 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	size_t			size;	/* Amount of data in a TX request. */
 	size_t			bytes_copied = 0;
 	struct usb_request	*req;
+	int			value;
 
 	DBG(dev, "printer_write trying to send %d bytes\n", (int)len);
 
@@ -634,7 +635,11 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 			return -EAGAIN;
 		}
 
-		if (usb_ep_queue(dev->in_ep, req, GFP_ATOMIC)) {
+		/* here, we unlock, and only unlock, to avoid deadlock. */
+		spin_unlock(&dev->lock);
+		value = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
+		spin_lock(&dev->lock);
+		if (value) {
 			list_add(&req->list, &dev->tx_reqs);
 			spin_unlock_irqrestore(&dev->lock, flags);
 			mutex_unlock(&dev->lock_printer_io);