linux-kernel - Re: [PATCH] USB: USB_OTG does not depend on PM

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Date:	Tue, 17 Nov 2015 16:21:06 -0600
From:	Felipe Balbi <balbi@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Peter Chen <Peter.Chen@...escale.com>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] USB: USB_OTG does not depend on PM


Hi,

Arnd Bergmann <arnd@...db.de> writes:
> On Tuesday 17 November 2015 15:38:33 Felipe Balbi wrote:
>> 
>> Arnd Bergmann <arnd@...db.de> writes:
>> > USB_OTG initially depended on USB_SUSPEND, which was later turned into
>> > PM_RUNTIME and finally into PM. I don't know at what point the dependency
>> > became unnecessary but it appears to work fine without CONFIG_PM now.
>> >
>> > However, we get lots of warnings in randconfig kernels like:
>> >
>> > warning: (USB_OTG_FSM && FSL_USB2_OTG && USB_MV_OTG) selects USB_OTG which has unmet direct dependencies (USB_SUPPORT && USB && PM)
>> >
>> > whenever CONFIG_PM is disabled and something else selects USB_OTG.
>> > Let's just drop the dependency to avoid the warnings.
>> >
>> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> > ---
>> > I keep seeing this one in my ARM randconfig test
>> 
>> and how did you test this ? Did you make sure you're not breaking HNP ?
>> For HNP to happen we depend on a bus_suspend and bus_suspend is only
>> available on CONFIG_PM, unless that has changed.
>> 
>> Seems like you've only compile tested this patch, is that correct ?
>
> Yes, I compile-tested only and inspected the code briefly without finding
> anything that contradicted this. It seems I missed the important part
> as you say, so we should instead add 'depends on PM' for the other
> symbols.

right, that might be better. I'll still read that code again, it has
been a few years since I looked at hnp at all.

-- 
balbi

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