linux-kernel - Re: [PATCH v2 06/35] brcmfmac: firmware: Support passing in multiple board

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Message-ID: <25eaec8a-337e-78b7-1bc3-7224a0218501@marcan.st>
Date:   Fri, 7 Jan 2022 13:02:01 +0900
From:   Hector Martin <marcan@...can.st>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>,
        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>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     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>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: Re: [PATCH v2 06/35] brcmfmac: firmware: Support passing in multiple
 board_types

On 2022/01/06 21:16, Arend van Spriel wrote:
> On 1/4/2022 8:26 AM, Hector Martin wrote:
>> In order to make use of the multiple alt_path functionality, change
>> board_type to an array. Bus drivers can pass in a NULL-terminated list
>> of board type strings to try for the firmware fetch.
> 
> Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
>> Acked-by: Linus Walleij <linus.walleij@...aro.org>
>> Signed-off-by: Hector Martin <marcan@...can.st>
>> ---
>>   .../broadcom/brcm80211/brcmfmac/firmware.c    | 35 ++++++++++++-------
>>   .../broadcom/brcm80211/brcmfmac/firmware.h    |  2 +-
>>   .../broadcom/brcm80211/brcmfmac/pcie.c        |  4 ++-
>>   .../broadcom/brcm80211/brcmfmac/sdio.c        |  2 +-
>>   4 files changed, 27 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
>> index 7570dbf22cdd..054ea3ed133e 100644
>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
>> @@ -594,28 +594,39 @@ static int brcmf_fw_complete_request(const struct firmware *fw,
>>   	return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret;
>>   }
>>   
>> -static int brcm_alt_fw_paths(const char *path, const char *board_type,
>> +static int brcm_alt_fw_paths(const char *path, struct brcmf_fw *fwctx,
>>   			     const char *alt_paths[BRCMF_FW_MAX_ALT_PATHS])
>>   {
>> +	const char **board_types = fwctx->req->board_types;
>> +	unsigned int i;
>>   	char alt_path[BRCMF_FW_NAME_LEN];
>>   	const char *suffix;
> 
> [...]
> 
>> +	for (i = 0; i < BRCMF_FW_MAX_ALT_PATHS; i++) {
>> +		if (!board_types[i])
>> +		    break;
>>   
>> -	strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
>> -	strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN);
>> -	strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN);
>> +		/* strip extension at the end */
>> +		strscpy(alt_path, path, BRCMF_FW_NAME_LEN);
>> +		alt_path[suffix - path] = 0;
>>   
>> -	alt_paths[0] = kstrdup(alt_path, GFP_KERNEL);
>> +		strlcat(alt_path, ".", BRCMF_FW_NAME_LEN);
>> +		strlcat(alt_path, board_types[i], BRCMF_FW_NAME_LEN);
>> +		strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN);
>> +
>> +		alt_paths[i] = kstrdup(alt_path, GFP_KERNEL);
>> +		brcmf_dbg(TRACE, "FW alt path: %s\n", alt_paths[i]);
> 
> Could use alt_path in the debug print thus avoiding additional array 
> access (working hard to find those nits to pick ;-) ).
> 

So you're saying my code is so good you have to resort to nits on this
level to make it clear you read it, right? ;-)

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