This is a note to let you know that I've just added the patch titled
usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1
to the 3.16-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-hub-prevent-hub-autosuspend-if-usbcore.autosuspend-is-1.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bdd405d2a5287bdb9b04670ea255e1f122138e66 Mon Sep 17 00:00:00 2001
From: Roger Quadros <rogerq@xxxxxx>
Date: Mon, 4 Aug 2014 12:44:46 +0300
Subject: usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1
From: Roger Quadros <rogerq@xxxxxx>
commit bdd405d2a5287bdb9b04670ea255e1f122138e66 upstream.
If user specifies that USB autosuspend must be disabled by module
parameter "usbcore.autosuspend=-1" then we must prevent
autosuspend of USB hub devices as well.
commit 596d789a211d introduced in v3.8 changed the original behaivour
and stopped respecting the usbcore.autosuspend parameter for hubs.
Fixes: 596d789a211d "USB: set hub's default autosuspend delay as 0"
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Tested-by: Michael Welling <mwelling@xxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1728,8 +1728,12 @@ static int hub_probe(struct usb_interfac
* - Change autosuspend delay of hub can avoid unnecessary auto
* suspend timer for hub, also may decrease power consumption
* of USB bus.
+ *
+ * - If user has indicated to prevent autosuspend by passing
+ * usbcore.autosuspend = -1 then keep autosuspend disabled.
*/
- pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
+ if (hdev->dev.power.autosuspend_delay >= 0)
+ pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
/*
* Hubs have proper suspend/resume support, except for root hubs
Patches currently in stable-queue which might be from rogerq@xxxxxx are
queue-3.16/usb-hub-prevent-hub-autosuspend-if-usbcore.autosuspend-is-1.patch
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