linux-kernel - Re: [PATCH v3 1/5] platform/x86: think-lmi: Enable opcode support on BIOS settings

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Message-Id: <90de5786-085c-4cff-8125-215c9ae20ad1@app.fastmail.com>
Date:   Mon, 29 May 2023 10:49:46 -0400
From:   "Mark Pearson" <mpearson-lenovo@...ebb.ca>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     "Hans de Goede" <hdegoede@...hat.com>,
        "markgross@...nel.org" <markgross@...nel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] platform/x86: think-lmi: Enable opcode support on BIOS
 settings



On Mon, May 29, 2023, at 7:51 AM, Ilpo Järvinen wrote:
> On Fri, 26 May 2023, Mark Pearson wrote:
>
>> Whilst reviewing some documentation from the FW team on using WMI on
>> Lenovo system I noticed that we weren't using Opcode support when
>> changing BIOS settings in the thinkLMI driver.
>> 
>> We should be doing this to ensure we're future proof as the old
>> non-opcode mechanism has been deprecated.
>> 
>> Tested on X1 Carbon G10 and G11.
>> 
>> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
>> ---
>> Changes in v2: Update comment for clearer explanation of what the driver
>> is doing
>> Changes in v3: None. Version bump with rest of series
>> 
>>  drivers/platform/x86/think-lmi.c | 28 +++++++++++++++++++++++++++-
>>  1 file changed, 27 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
>> index 1138f770149d..2745224f62ab 100644
>> --- a/drivers/platform/x86/think-lmi.c
>> +++ b/drivers/platform/x86/think-lmi.c
>> @@ -1001,7 +1001,33 @@ static ssize_t current_value_store(struct kobject *kobj,
>>  				tlmi_priv.pwd_admin->save_signature);
>>  		if (ret)
>>  			goto out;
>> -	} else { /* Non certiifcate based authentication */
>> +	} else if (tlmi_priv.opcode_support) {
>> +		/*
>> +		 * If opcode support is present use that interface.
>> +		 * Note - this sets the variable and then the password as separate
>> +		 * WMI calls. Function tlmi_save_bios_settings will error if the
>> +		 * password is incorrect.
>> +		 */
>> +		set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
>> +					new_setting);
>
> Alignment.

OK - I assume you want the new_setting lined up under the bracket.
I've not seen that called out as a requirement (https://www.kernel.org/doc/html/v4.10/process/coding-style.html) but I don't mind fixing....but if you can point me at the specifics it's appreciated

>
>> +		if (!set_str) {
>> +			ret = -ENOMEM;
>> +			goto out;
>> +		}
>> +
>> +		ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
>> +		if (ret)
>> +			goto out;
>> +
>> +		if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
>> +			ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
>> +					tlmi_priv.pwd_admin->password);
>
> Align.

Ack.

>
>> +			if (ret)
>> +				goto out;
>> +		}
>> +
>> +		ret = tlmi_save_bios_settings("");
>> +	} else { /* old non opcode based authentication method (deprecated)*/
>
> non missing hyphen.

non-opcode I assume?

>
> Missing space at the comment closing.

Will fix.

>
>>  		if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
>>  			auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
>>  					tlmi_priv.pwd_admin->password,
>> 
>
> Except for those style issues, it look okay to me:
>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
>
Thanks for the review!
Mark