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

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Message-ID: <20150807021145.GA13200@shlinux2>
Date:	Fri, 7 Aug 2015 10:11:47 +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 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.


>  
>  	data->dev = &misc_pdev->dev;
> -- 
> 2.4.3
> 

-- 

Best Regards,
Peter Chen
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