patch "usb: dwc3: gadget: always unmap EP0 requests" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: dwc3: gadget: always unmap EP0 requests

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Felipe Balbi <[email protected]>
Date: Tue, 20 Dec 2016 14:14:40 +0200
Subject: usb: dwc3: gadget: always unmap EP0 requests

commit 0416e494ce7d ("usb: dwc3: ep0: correct cache sync issue in case of ep0_bounced") introduced a bug where we would leak DMA resources which would cause us to starve the system of them resulting in failing DMA transfers.

Fix the bug by making sure that we always unmap EP0 requests since those are *always* mapped.

sync issue in case of ep0_bounced")

---
 drivers/usb/dwc3/gadget.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

index efddaf5d11d1..0286e3141864 100644
@@ -180,11 +180,11 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 	if (req->request.status == -EINPROGRESS)
 		req->request.status = status;
 
-	if (dwc->ep0_bounced && dep->number == 0)
+	if (dwc->ep0_bounced && dep->number <= 1)
 		dwc->ep0_bounced = false;
-	else
-		usb_gadget_unmap_request_by_dev(dwc->sysdev,
-				&req->request, req->direction);
+
+	usb_gadget_unmap_request_by_dev(dwc->sysdev,
+			&req->request, req->direction);
 
 	trace_dwc3_gadget_giveback(req);
 

2.11.0