linux-kernel - RE: [PATCH] lan78xx: Protect runtime_auto check by #ifdef CONFIG

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Message-ID: <9235D6609DB808459E95D78E17F2E43D404CBFF1@CHN-SV-EXMX02.mchp-main.com>
Date:	Mon, 21 Mar 2016 14:59:38 +0000
From:	<Woojung.Huh@...rochip.com>
To:	<linux@...ck-us.net>, <geert@...ux-m68k.org>,
	<UNGLinuxDriver@...rochip.com>, <davem@...emloft.net>
CC:	<rjw@...ysocki.net>, <netdev@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] lan78xx: Protect runtime_auto check by #ifdef CONFIG_PM

> -----Original Message-----
> From: Guenter Roeck [mailto:linux@...ck-us.net]
> Sent: Sunday, March 20, 2016 6:59 PM
> To: Geert Uytterhoeven; Woojung Huh - C21699; UNGLinuxDriver; David S.
> Miller
> Cc: Rafael J. Wysocki; netdev@...r.kernel.org; linux-usb@...r.kernel.org;
> linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] lan78xx: Protect runtime_auto check by #ifdef
> CONFIG_PM
>  
> Not that it matters anymore since David reverted the original patch,
> but my reason for not sending a similar patch was that I wasn't sure
> if .runtime_auto should be accessed from drivers in the first place,
> or if there is some logical problem with the code.
> 

Because driver can enable/disable autosuspend by usb_enable_autosuspend() and
usb_disable_autosuspend(), it would be nice to have helper to find out autosuspend status.

The code path was to utilize autosuspend power saving, when it is enabled.

Woojung