linux-kernel - Re: [PATCH] usb otg: use atomic notifier instead of blocking notifier

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Message-ID: <20110120020638.GA24396@darkstar>
Date:	Thu, 20 Jan 2011 10:06:38 +0800
From:	Yang Ruirui <ruirui.r.yang@...to.com>
To:	Felipe Balbi <balbi@...com>
CC:	Yang Ruirui R <ruirui.r.yang@...toenator.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Mian Yousaf Kaukab <mian.yousaf.kaukab@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	Heikki Krogerus <ext-heikki.krogerus@...ia.com>,
	Tejun Heo <tj@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>, Hema HK <hemahk@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb otg: use atomic notifier instead of blocking notifier

On Wed, Jan 19, 2011 at 12:40:32PM +0200, Felipe Balbi wrote:
> hi,
> 
> On Wed, Jan 19, 2011 at 05:20:11PM +0800, Yang Ruirui wrote:
> > 
> > following bug happens with meego 2.6.35 kernel on nokia n900:
> 
> <snip>
> 
> > Actually the blocking notifier chain runs in process context, so not fit for use here.
> > 
> > For mainline kernel there's such issue as well.
> > Here fix this problem by changing to use atomic_notifier.
> > 
> > Signed-off-by: Yang Ruirui <ruirui.r.yang@...to.com>
> > ---
> >  drivers/usb/otg/ab8500-usb.c  |    6 +++---
> >  drivers/usb/otg/twl4030-usb.c |    6 +++---
> >  drivers/usb/otg/twl6030-usb.c |    6 +++---
> 
> you're missing the other transceivers:
> drivers/usb/otg/langwell_otg.c
> drivers/usb/otg/msm72k_otg.c
> drivers/usb/otg/gpio_vbus.c
> drivers/usb/otg/nop-usb-xceiv.c
> drivers/usb/otg/ulpi.c
> drivers/usb/otg/isp1301_omap.c

Hi, thanks

Actually I does not found where notifiers are used in these files except
langwell_otg

For langwell_otg.c there's a wrapper struct named "intel mid_otg_xceiv"
in include/linux/usb/intel_mid_otg.h, it use an atomic notifier for
interrupt context.

So I think we'd better write another patch to make it use general
otg_transceiver for notifier or just keep current code. What's your opinion?

> 
> -- 
> balbi
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