linux-kernel - Re: RE: [PATCH] Add Silicom Platform Driver

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Date:   Fri, 28 Jul 2023 18:47:03 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Huibin Shi <henrys@...icom-usa.com>,
        Henry Shi <henryshi2018@...il.com>,
        "hbshi69@...mail.com" <hbshi69@...mail.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "markgross@...nel.org" <markgross@...nel.org>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
Cc:     "hb_shi2003@...oo.com" <hb_shi2003@...oo.com>,
        Wen Wang <wenw@...icom-usa.com>
Subject: Re: RE: [PATCH] Add Silicom Platform Driver

Le 28/07/2023 à 14:59, Huibin Shi a écrit :
> Christophe,
> 
> Thanks for the comments. See my comments below.
> 
> Updated patch will be sent out later after review comments from other reviewers are addressed.
> 
> Henry
> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Sent: Tuesday, July 25, 2023 5:03 PM
> To: Henry Shi <henryshi2018@...il.com>; hbshi69@...mail.com; tglx@...utronix.de; mingo@...hat.com; bp@...en8.de; dave.hansen@...ux.intel.com; x86@...nel.org; hpa@...or.com; hdegoede@...hat.com; markgross@...nel.org; jdelvare@...e.com; linux@...ck-us.net; linux-kernel@...r.kernel.org; platform-driver-x86@...r.kernel.org; linux-hwmon@...r.kernel.org
> Cc: hb_shi2003@...oo.com; Huibin Shi <henrys@...icom-usa.com>; Wen Wang <wenw@...icom-usa.com>
> Subject: Re: [PATCH] Add Silicom Platform Driver
> 
> Caution: This is an external email. Please take care when clicking links or opening attachments.
> 
> 
> Le 18/07/2023 à 18:01, Henry Shi a écrit :
>> The Silicom platform (silicom-platform) Linux driver for Swisscom
>> Business Box (Swisscom BB) as well as Cordoba family products is a
>> software solution designed to facilitate the efficient management and
>> control of devices through the integration of various Linux
>> frameworks. This platform driver provides seamless support for device
>> management via the Linux LED framework, GPIO framework, Hardware
>> Monitoring (HWMON), and device attributes. The Silicom platform
>> driver's compatibility with these Linux frameworks allows applications
>> to access and control Cordoba family devices using existing software
>> that is compatible with these frameworks. This compatibility
>> simplifies the development process, reduces dependencies on
>> proprietary solutions, and promotes interoperability with other
>> Linux-based systems and software.
>>
>> Signed-off-by: Henry Shi <henryshi2018@...il.com>
>> ---
> 
> [...]
> 
>> +static int __init silicom_mc_leds_register(struct device *dev,
>> +                                        const struct led_classdev_mc
>> +*mc_leds) {
>> +     struct led_classdev_mc *led;
>> +     int i, err;
>> +
>> +     for (i = 0; mc_leds[i].led_cdev.name; i++) {
>> +             /* allocate and copy data from the init constansts */
>> +             led = devm_kzalloc(dev, sizeof(struct led_classdev_mc),
>> + GFP_KERNEL);
> 
> sizeof(*led) is shorter.
> Mostly a matter of taste.
> 
> Maybe even devm_kmemdup()?
> 
> Henry: thanks. Devm_kmemdup() API requires additional argument that is not necessary of this driver. I prefer devm_kzalloc for now.

CJ: The only additionnal parameter I can think of are the one of 
memcpy() ...

> 
>> +             if (IS_ERR_OR_NULL(led)) {
> 
> if (!led)
> is enough.
> 
> Henry: OK, changed
> 
>> +                     dev_err(dev, "Failed to alloc
>> + led_classdev_mc[%d]: %ld\n", i, PTR_ERR(led));
> 
> This kind of message is useless and should be removed (checkpatch should warn about it)
> 
> Henry: OK, removed.
> 
>> +                     return -ENOMEM;
>> +             }
>> +             memcpy(led, &mc_leds[i], sizeof(*led));

... here.

devm_kzalloc() + this memcpy() could be done with only devm_kmemdup().

This is mostly a matter of taste.

>> +
>> +             led->subled_info = devm_kzalloc(dev, led->num_colors * sizeof(struct mc_subled),
>> +                                             GFP_KERNEL);
> 
> Maybe even devm_kmemdup()?

Same...

> 
>> +             if (IS_ERR_OR_NULL(led->subled_info)) {
> 
> if (!led->subled_info)
> is enough.
> 
> Henry: OK, changed.
> 
>> +                     dev_err(dev, "Failed to alloc subled_info[%d]: %ld\n",
>> +                             i, PTR_ERR(led->subled_info));
> 
> This kind of message is useless and should be removed (checkpatch should warn about it)
> 
> Henry: OK, removed.
> 
>> +                     return -ENOMEM;
>> +             }
>> +             memcpy(led->subled_info, mc_leds[i].subled_info,
>> +                     led->num_colors * sizeof(struct mc_subled));

... here.

CJ