This patch is okay for the stable branches if the follow-up patch for CONFIG_PM_RUNTIME is also applied. https://lkml.org/lkml/2014/8/27/645 On Wed, Sep 3, 2014 at 4:58 PM, <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > 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 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html