linux-kernel - Re: [PATCH 1/2] usb: ehci-exynos: Return immediately from suspend if ehci

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Message-id: <001a01cf5453$243d9c70$6cb8d550$%han@samsung.com>
Date:	Thu, 10 Apr 2014 09:23:48 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Alan Stern' <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, kgene.kim@...sung.com,
	'Vivek Gautam' <gautam.vivek@...sung.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH 1/2] usb: ehci-exynos: Return immediately from suspend if
 ehci_suspend fails

On Thursday, April 10, 2014 3:32 AM, Alan Stern wrote:
> On Wed, 9 Apr 2014, Vivek Gautam wrote:
> 
> > Patch 'b8efdaf USB: EHCI: add check for wakeup/suspend race'
> > adds a check for possible race between suspend and wakeup interrupt,
> > and thereby it returns -EBUSY as error code if there's a wakeup
> > interrupt.
> > So the platform host controller should not proceed further with
> > its suspend callback, rather should return immediately to avoid
> > powering down the essential things, like phy.
> >
> > Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> > Cc: Alan Stern <stern@...land.harvard.edu>
> > Cc: Jingoo Han <jg1.han@...sung.com>
> > ---
> >
> > Based on 'usb-next' branch of Greg's usb tree.
> >
> >  drivers/usb/host/ehci-exynos.c |    4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> > index d1d8c47..a4550eb 100644
> > --- a/drivers/usb/host/ehci-exynos.c
> > +++ b/drivers/usb/host/ehci-exynos.c
> > @@ -212,6 +212,8 @@ static int exynos_ehci_suspend(struct device *dev)
> >  	int rc;
> >
> >  	rc = ehci_suspend(hcd, do_wakeup);
> > +	if (rc)
> > +		return rc;
> >
> >  	if (exynos_ehci->otg)
> >  		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> > @@ -221,7 +223,7 @@ static int exynos_ehci_suspend(struct device *dev)
> >
> >  	clk_disable_unprepare(exynos_ehci->clk);
> >
> > -	return rc;
> > +	return 0;
> >  }
> >
> >  static int exynos_ehci_resume(struct device *dev)
> 
> The first hunk of this patch is correct, but the second hunk isn't
> needed.  A similar remark is true for the ehci-platform patch.

Hi Alan,

Do you mean the following?

1st hunk
 +	if (rc)
 +		return rc;

2nd hunk
 -	return rc;
 +	return 0;

Currently, the 'rc' will be always 'zero'; however, I don't
Have any objection, because the code might be  modified later.

Best regards,
Jingoo Han
> 
> Alan Stern

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