linux-kernel - Re: [PATCH v2] usb: hub: Prevent hub autosuspend if usbcore.autosuspend is -1

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Date:	Wed, 27 Aug 2014 12:23:39 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Roger Quadros <rogerq@...com>
Cc:	stern@...land.harvard.edu, balbi@...com, ming.lei@...onical.com,
	mwelling@...cinc.com, stefan@...brechtsmeier.net,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"[3.8+]" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] usb: hub: Prevent hub autosuspend if
 usbcore.autosuspend is -1

On Wed, Aug 27, 2014 at 03:11:10PM +0300, Roger Quadros wrote:
> 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"
> 
> Cc: [3.8+] <stable@...r.kernel.org>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/core/hub.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 8a4dcbc..59b599d 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1728,8 +1728,14 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
>  	 * - 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);
> +#ifdef CONFIG_PM_RUNTIME
> +	if (hdev->dev.power.autosuspend_delay >= 0)
> +		pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
> +#endif
>  
>  	/*
>  	 * Hubs have proper suspend/resume support, except for root hubs

Sorry, but can I have a patch that just adds the #ifdef as I already
have your original one in my tree.

thanks,

greg k-h
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