linux-kernel - Re: [PATCH 19/21] usb: chipidea: msm: Be silent on probe defer errors

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Date:	Thu, 30 Jun 2016 09:06:28 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Stephen Boyd <stephen.boyd@...aro.org>
Cc:	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	Andy Gross <andy.gross@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>,
	Neil Armstrong <narmstrong@...libre.com>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
	Peter Chen <peter.chen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 19/21] usb: chipidea: msm: Be silent on probe defer errors

On Sun, Jun 26, 2016 at 12:28:36AM -0700, Stephen Boyd wrote:
> If something fails in ci_hdrc_add_device() due to probe defer, we
> shouldn't print an error message. Be silent in this case as we'll
> try probe again later.
> 
> Cc: Peter Chen <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  drivers/usb/chipidea/ci_hdrc_msm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
> index 7d191928e55b..2ed9a181f4b6 100644
> --- a/drivers/usb/chipidea/ci_hdrc_msm.c
> +++ b/drivers/usb/chipidea/ci_hdrc_msm.c
> @@ -241,7 +241,8 @@ static int ci_hdrc_msm_probe(struct platform_device *pdev)
>  	plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
>  				     pdev->num_resources, &ci->pdata);
>  	if (IS_ERR(plat_ci)) {
> -		dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
> +		if (PTR_ERR(plat_ci) != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
>  		ret = PTR_ERR(plat_ci);
>  		goto err_mux;
>  	}

Why not let ret equals to PTR_ERR(plat_ci) first, and using ret to
compare?

-- 

Best Regards,
Peter Chen