linux-kernel - Re: [PATCH v2] hwmon/pmbus: use simple i2c probe function

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Date:   Fri, 7 Aug 2020 11:08:19 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Stephen Kitt <steve@....org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon/pmbus: use simple i2c probe function

On Fri, Aug 07, 2020 at 09:45:26AM +0200, Stephen Kitt wrote:
> pmbus_do_probe doesn't use the id information provided in its second
> argument, so this can be removed, which then allows using the
> single-parameter i2c probe function ("probe_new") for probes.
> 
> This avoids scanning the identifier tables during probes.
> 
> Drivers which didn't use the id are converted as-is; drivers which did
> are modified as follows:
> 
> * if the information in i2c_client is sufficient, that's used instead
>   (client->name);
> * configured v. probed comparisons are performed by comparing the
>   configured name to the detected name, instead of the ids; this
>   involves strcmp but is still cheaper than comparing all the device
>   names when scanning the tables;
> * anything else is handled by calling i2c_match_id() with the same
>   level of error-handling (if any) as before.
> 
> Signed-off-by: Stephen Kitt <steve@....org>

I haven't checked the patch in detail, just saying that the bulk move to
probe_new is much appreciated, so:

Acked-by: Wolfram Sang <wsa@...nel.org>

One thing hit my eye, though:

>  	if (md)
>  		vs = (enum versions)md;
> -	else if (id)
> -		vs = (enum versions)id->driver_data;
> +	else {
> +		id = i2c_match_id(ibm_cffps_id, client);
> +		if (id)
> +			vs = (enum versions)id->driver_data;
> +	}

Missing braces in the if-block here. 'checkpatch --strict' warns about
it:

CHECK: Unbalanced braces around else statement
#230: FILE: drivers/hwmon/pmbus/ibm-cffps.c:490:
+	else {


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