netdev - Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device

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Message-ID: <5a6550d9-083a-cc50-a6c0-ce035ceb1b2f@roeck-us.net>
Date:   Mon, 19 Apr 2021 06:36:35 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Alice Guo (OSS)" <alice.guo@....nxp.com>,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        horia.geanta@....com, aymen.sghaier@....com,
        herbert@...dor.apana.org.au, davem@...emloft.net, tony@...mide.com,
        geert+renesas@...der.be, mturquette@...libre.com, sboyd@...nel.org,
        vkoul@...nel.org, peter.ujfalusi@...il.com, a.hajda@...sung.com,
        narmstrong@...libre.com, robert.foss@...aro.org, airlied@...ux.ie,
        daniel@...ll.ch, khilman@...libre.com, tomba@...nel.org,
        jyri.sarha@....fi, joro@...tes.org, will@...nel.org,
        mchehab@...nel.org, ulf.hansson@...aro.org,
        adrian.hunter@...el.com, kishon@...com, kuba@...nel.org,
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        j-keerthy@...com, balbi@...nel.org, linux@...sktech.co.nz,
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Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, dmaengine@...r.kernel.org,
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        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [RFC v1 PATCH 3/3] driver: update all the code that use
 soc_device_match

On 4/18/21 9:27 PM, Alice Guo (OSS) wrote:
> From: Alice Guo <alice.guo@....com>
> 
> Update all the code that use soc_device_match because add support for
> soc_device_match returning -EPROBE_DEFER.
> 
> Signed-off-by: Alice Guo <alice.guo@....com>
> ---
[ ... ]
>  drivers/watchdog/renesas_wdt.c                |  2 +-
>  48 files changed, 131 insertions(+), 52 deletions(-)
> 
[ ... ]
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 5791198960e6..fdc534dc4024 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -197,7 +197,7 @@ static bool rwdt_blacklisted(struct device *dev)
>  	const struct soc_device_attribute *attr;
>  
>  	attr = soc_device_match(rwdt_quirks_match);
> -	if (attr && setup_max_cpus > (uintptr_t)attr->data) {
> +	if (!IS_ERR(attr) && attr && setup_max_cpus > (uintptr_t)attr->data) {

This is wrong. We can not make the decision below without having access
to attr. The function may wrongly return false if soc_device_match()
returns an error.

Guenter

>  		dev_info(dev, "Watchdog blacklisted on %s %s\n", attr->soc_id,
>  			 attr->revision);
>  		return true;
>