netdev - Re: [PATCH] mwifiex: Add quirk to disable deep sleep with certain hardware revision

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Date:   Wed, 3 Nov 2021 14:37:53 +0100
From:   Jonas Dreßler <verdre@...d.nl>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi017@...il.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tsuchiya Yuto <kitakar@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Maximilian Luz <luzmaximilian@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Pali Rohár <pali@...nel.org>
Subject: Re: [PATCH] mwifiex: Add quirk to disable deep sleep with certain
 hardware revision

On 11/3/21 13:25, Jonas Dreßler wrote:
> 
>>
>>> --- a/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
>>> +++ b/drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
>>> @@ -708,6 +708,22 @@ static int mwifiex_ret_ver_ext(struct mwifiex_private *priv,
>>>   {
>>>          struct host_cmd_ds_version_ext *ver_ext = &resp->params.verext;
>>>
>>> +       if (test_and_clear_bit(MWIFIEX_IS_REQUESTING_FW_VEREXT, &priv->adapter->work_flags)) {
>>> +               if (strncmp(ver_ext->version_str, "ChipRev:20, BB:9b(10.00), RF:40(21)", 128) == 0) {
>>
>> Rather than memorize the 128-size array here, maybe use
>> sizeof(ver_ext->version_str) ?
> 
> Sounds like a good idea, yeah.

Nevermind, the reason I did this was for consistency in the
function, right underneath in the same function it also assumes
a fixed size of 128 characters, so I'd rather use the same
length.

>		memcpy(version_ext->version_str, ver_ext->version_str,
>		       sizeof(char) * 128);
>		memcpy(priv->version_str, ver_ext->version_str, 128);

Might be a good idea to #define it as MWIFIEX_VERSION_STR_LENGTH
in fw.h though...