Patch "usb: dwc3: core: avoid Overflow events" has been added to the 4.4-stable tree

Patch "usb: dwc3: core: avoid Overflow events" has been added to the 4.4-stable tree

[gregkh]

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

    usb: dwc3: core: avoid Overflow events

to the 4.4-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-core-avoid-overflow-events.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e71d363d9c611c99fb78f53bfee99616e7fe352c Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Fri, 23 Dec 2016 14:40:40 +0200
Subject: usb: dwc3: core: avoid Overflow events

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

commit e71d363d9c611c99fb78f53bfee99616e7fe352c upstream.

Now that we're handling so many transfers at a time
and for some dwc3 revisions LPM events *must* be
enabled, we can fall into a situation where too many
events fire and we start receiving Overflow events.

Let's do what XHCI does and allocate a full page for
the Event Ring, this will avoid any future issues.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/dwc3/core.h |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -42,9 +42,7 @@
 #define DWC3_XHCI_RESOURCES_NUM	2
 
 #define DWC3_SCRATCHBUF_SIZE	4096	/* each buffer is assumed to be 4KiB */
-#define DWC3_EVENT_SIZE		4	/* bytes */
-#define DWC3_EVENT_MAX_NUM	64	/* 2 events/endpoint */
-#define DWC3_EVENT_BUFFERS_SIZE	(DWC3_EVENT_SIZE * DWC3_EVENT_MAX_NUM)
+#define DWC3_EVENT_BUFFERS_SIZE	4096
 #define DWC3_EVENT_TYPE_MASK	0xfe
 
 #define DWC3_EVENT_TYPE_DEV	0


Patches currently in stable-queue which might be from felipe.balbi@linux.intel.com are

queue-4.4/usb-dummy-hcd-fix-bug-in-stop_activity-handle-ep0.patch
queue-4.4/usb-dwc3-core-avoid-overflow-events.patch
queue-4.4/usb-gadgetfs-fix-use-after-free-bug.patch
queue-4.4/usb-gadget-composite-test-get_alt-presence-instead-of-set_alt.patch
queue-4.4/usb-gadgetfs-restrict-upper-bound-on-device-configuration-size.patch
queue-4.4/usb-gadgetfs-fix-checks-of-wtotallength-in-config-descriptors.patch
queue-4.4/usb-gadgetfs-fix-unbounded-memory-allocation-bug.patch