linux-kernel - Re: [PATCH] usb: chipidea: imx: properly check for usbmisc

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Date:	Fri, 7 Aug 2015 12:46:04 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
CC:	<linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: chipidea: imx: properly check for usbmisc

On Fri, Aug 07, 2015 at 10:11:47AM +0800, Peter Chen wrote:
> On Thu, Aug 06, 2015 at 03:09:54PM +0200, Tomeu Vizoso wrote:
> > If usbmisc hasn't probed yet, defer the probe.
> > 
> > It's not enough to check if the platform device for the OF node of the
> > usbmisc has been registered, but it also needs to have been probed
> > already before we can call imx_usbmisc_init().
> > 
> > This can happen if the order in which devices are probed change due to
> > async probing or on-demand probing of dependencies.
> > 
> > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> > ---
> >  drivers/usb/chipidea/ci_hdrc_imx.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> > index 504554e41922..e3c61d5e9270 100644
> > --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> > +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> > @@ -104,7 +104,7 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
> >  	misc_pdev = of_find_device_by_node(args.np);
> >  	of_node_put(args.np);
> >  
> > -	if (!misc_pdev)
> > +	if (!misc_pdev || !platform_get_drvdata(misc_pdev))
> >  		return ERR_PTR(-EPROBE_DEFER);
> 
> "||"? or "&&"? You want usbmisc has already been probed.

Oh, oops. The patch is right, I will queue it.

-- 

Best Regards,
Peter Chen
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