netdev - Re: [PATCH 16/34] brcmfmac: acpi: Add support for fetching Apple ACPI properties

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Date:   Tue, 4 Jan 2022 14:22:57 +0900
From:   Hector Martin <marcan@...can.st>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "brcm80211-dev-list.pdl@...adcom.com" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        "SHA-cyfmac-dev-list@...ineon.com" <SHA-cyfmac-dev-list@...ineon.com>
Subject: Re: [PATCH 16/34] brcmfmac: acpi: Add support for fetching Apple ACPI
 properties

On 2022/01/04 7:50, Andy Shevchenko wrote:
>     >     +       status = acpi_evaluate_object(adev->handle, "RWCV",
>     NULL, &buf);
>     >     +       o = buf.pointer;
>     >     +       if (!ACPI_FAILURE(status) && o && o->type ==
>     ACPI_TYPE_BUFFER &&
>     >     +           o->buffer.length >= 2) {
>     >     +               char *antenna_sku = devm_kzalloc(dev, 3,
>     GFP_KERNEL);
>     >     +
>     >     +               memcpy(antenna_sku, o->buffer.pointer, 2);
>     >
>     >
>     > NIH devm_kmemdup()?
> 
>     Not *quite*. I take the first two bytes of the returned buffer and turn
>     them into a null-terminated 3-byte string. kmemdup wouldn't
>     null-terminate or would copy too much, depending on length.
> 
> 
> 
> devm_kstrndup() then?
> 
>  

That doesn't seem to be a thing.


-- 
Hector Martin (marcan@...can.st)
Public Key: https://mrcn.st/pub