linux-kernel - [PATCH 3.12 116/235] usb: dwc3: gadget: always unmap EP0 requests

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Message-Id: <44f88151edb80b4fe818e7023424f596238a7f96.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:54:09 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 116/235] usb: dwc3: gadget: always unmap EP0 requests

From: Felipe Balbi <felipe.balbi@...ux.intel.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit d62145929992f331fdde924d5963ab49588ccc7d upstream.

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.

Fixes: 0416e494ce7d ("usb: dwc3: ep0: correct cache
	sync issue in case of ep0_bounced")
Tested-by: Tomasz Medrek <tomaszx.medrek@...el.com>
Reported-by: Janusz Dziedzic <januszx.dziedzic@...ux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/dwc3/gadget.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index af03ea2c9c78..f4a36f4669bb 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -245,11 +245,11 @@ 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(&dwc->gadget, &req->request,
-				req->direction);
+
+	usb_gadget_unmap_request(&dwc->gadget, &req->request,
+			req->direction);
 
 	dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 			req, dep->name, req->request.actual,
-- 
2.11.0