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Patch "usb: dwc3: gadget: increment request->actual once" has been added to the 3.14-stable tree

PATCH [email protected] 1 participant 1 message Sep 2, 2016

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Stable branch USB DesignWare USB3 DRD IP driver
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This is a note to let you know that I've just added the patch titled

    usb: dwc3: gadget: increment request->actual once

to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-dwc3-gadget-increment-request-actual-once.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From c7de573471832dff7d31f0c13b0f143d6f017799 Mon Sep 17 00:00:00 2001

From: Felipe Balbi <[email protected]>
Date: Fri, 29 Jul 2016 03:17:58 +0300
Subject: usb: dwc3: gadget: increment request->actual once

From: Felipe Balbi <[email protected]>

commit c7de573471832dff7d31f0c13b0f143d6f017799 upstream.

When using SG lists, we would end up setting
request->actual to:

	num_mapped_sgs * (request->length - count)

Let's fix that up by incrementing request->actual
only once.

Reported-by Brian E Rogers <[email protected]>
Signed-off-by Felipe Balbi <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/usb/dwc3/gadget.c |   19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)
drivers/usb/dwc3/gadget.c +11 -8
@@ -1799,14 +1799,6 @@ static int __dwc3_cleanup_done_trbs(stru
 			s_pkt = 1;
 	}
 
-	/*
-	 * We assume here we will always receive the entire data block
-	 * which we should receive. Meaning, if we program RX to
-	 * receive 4K but we receive only 2K, we assume that's all we
-	 * should receive and we simply bounce the request back to the
-	 * gadget driver for further processing.
-	 */
-	req->request.actual += req->request.length - count;
 	if (s_pkt)
 		return 1;
 	if ((event->status & DEPEVT_STATUS_LST) &&

@@ -1826,6 +1818,7 @@ static int dwc3_cleanup_done_reqs(struct
 	struct dwc3_trb		*trb;
 	unsigned int		slot;
 	unsigned int		i;
+	int			count = 0;
 	int			ret;
 
 	do {

@@ -1842,6 +1835,8 @@ static int dwc3_cleanup_done_reqs(struct
 				slot++;
 			slot %= DWC3_TRB_NUM;
 			trb = &dep->trb_pool[slot];
+			count += trb->size & DWC3_TRB_SIZE_MASK;
+
 
 			ret = __dwc3_cleanup_done_trbs(dwc, dep, req, trb,
 					event, status);

@@ -1849,6 +1844,14 @@ static int dwc3_cleanup_done_reqs(struct
 				break;
 		}while (++i < req->request.num_mapped_sgs);
 
+		/*
+		 * We assume here we will always receive the entire data block
+		 * which we should receive. Meaning, if we program RX to
+		 * receive 4K but we receive only 2K, we assume that's all we
+		 * should receive and we simply bounce the request back to the
+		 * gadget driver for further processing.
+		 */
+		req->request.actual += req->request.length - count;
 		dwc3_gadget_giveback(dep, req, status);
 
 		if (ret)

Patches currently in stable-queue which might be from [email protected] are

queue-3.14/usb-dwc3-gadget-increment-request-actual-once.patch