Patch "usb: Increase quirk delay for USB devices" has been added to the 4.9-stable tree

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

usb: Increase quirk delay for USB devices

to the 4.9-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-increase-quirk-delay-for-usb-devices.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Dmitry Fleytman <[email protected]>
Date: Tue, 5 Sep 2017 11:40:56 +0300
Subject: usb: Increase quirk delay for USB devices

From: Dmitry Fleytman <[email protected]>

commit b2a542bbb3081dbd64acc8929c140d196664c406 upstream.

Commit e0429362ab15
("usb: Add device quirk for Logitech HD Pro Webcams C920 and C930e") introduced quirk to workaround an issue with some Logitech webcams.

The workaround is introducing delay for some USB operations.

According to our testing, delay introduced by original commit is not long enough and in rare cases we still see issues described by the aforementioned commit.

This patch increases delays introduced by original commit. Having this patch applied we do not see those problems anymore.

---
 drivers/usb/core/config.c |    2 +-
 drivers/usb/core/hub.c    |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

@@ -847,7 +847,7 @@ int usb_get_configuration(struct usb_dev
 		}
 
 		if (dev->quirks & USB_QUIRK_DELAY_INIT)
-			msleep(100);
+			msleep(200);
 
 		result = usb_get_descriptor(dev, USB_DT_CONFIG, cfgno,
 		    bigbuffer, length);

@@ -4828,7 +4828,7 @@ static void hub_port_connect(struct usb_
 			goto loop;
 
 		if (udev->quirks & USB_QUIRK_DELAY_INIT)
-			msleep(1000);
+			msleep(2000);
 
 		/* consecutive bus-powered hubs aren't reliable; they can
 		 * violate the voltage drop budget.  if the new child has

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

queue-4.9/usb-increase-quirk-delay-for-usb-devices.patch