linux-kernel - Re: [PATCH] usb: chipidea: host: Disable port power only if previously enabled

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Date:   Sun, 29 Dec 2019 08:28:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Peter Chen <peter.chen@...escale.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: chipidea: host: Disable port power only if
 previously enabled

On Sat, Dec 28, 2019 at 02:33:01PM -0500, Alan Stern wrote:
> 
> Let's try a slightly different approach.  What happens with this patch?
> 
> Alan Stern
> 
> 
> Index: usb-devel/drivers/usb/core/hub.c
> ===================================================================
> --- usb-devel.orig/drivers/usb/core/hub.c
> +++ usb-devel/drivers/usb/core/hub.c
> @@ -1065,6 +1065,7 @@ static void hub_activate(struct usb_hub
>  		if (type == HUB_INIT) {
>  			delay = hub_power_on_good_delay(hub);
>  
> +			hub->power_bits[0] = ~0UL;	/* All ports on */
>  			hub_power_on(hub, false);
>  			INIT_DELAYED_WORK(&hub->init_work, hub_init_func2);
>  			queue_delayed_work(system_power_efficient_wq,
> 

That doesn't make a difference - the traceback is still seen with this patch
applied.

Guenter