netdev - Re: [PATCH V5 2/2] brcmfmac: don't warn user about NVRAM if fallback to the platform one succeeds

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Date:   Tue, 1 Aug 2017 23:20:32 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Rafał Miłecki <zajec5@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Wagner <wagi@...om.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>, yi1.li@...ux.intel.com,
        atull@...nel.org, Moritz Fischer <moritz.fischer@...us.com>,
        pmladek@...e.com, Johannes Berg <johannes.berg@...el.com>,
        emmanuel.grumbach@...el.com, luciano.coelho@...el.com,
        Kalle Valo <kvalo@...eaurora.org>, luto@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        David Howells <dhowells@...hat.com>, pjones@...hat.com,
        Hans de Goede <hdegoede@...hat.com>, alan@...ux.intel.com,
        tytso@....edu, lkml <linux-kernel@...r.kernel.org>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V5 2/2] brcmfmac: don't warn user about NVRAM if fallback
 to the platform one succeeds

On 31-07-17 17:09, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> Failing to load NVRAM *file* isn't critical if we manage to get platform
> NVRAM in the fallback path. It means warnings like:
> [   10.801506] brcmfmac 0000:01:00.0: Direct firmware load for brcm/brcmfmac43602-pcie.txt failed with error -2
> are unnecessary & disturbing for people with *platform* NVRAM as they
> are not expected to have NVRAM file. This is a very common case for
> Broadcom home routers.
> 
> Instead of printing warning immediately within the firmware subsystem
> let's try our fallback code first. If that fails as well, then it's a
> right moment to print an error.
> 
> This should reduce amount of false reports from users seeing this
> warning while having wireless working perfectly fine with the platform
> NVRAM.

Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
> V2: Update commit message as it wasn't clear enough (thanks Andy) & add extra
>     messages to the firmware.c.
> V3: Set FW_OPT_UEVENT to don't change behavior
> V4: Switch to the new request_firmware_async syntax
> V5: Rebase, update commit message, resend after drvdata discussion
> ---
>  .../wireless/broadcom/brcm80211/brcmfmac/firmware.c    | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> index d231042f19d6..524442b3870f 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c
> @@ -462,8 +462,14 @@ static void brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx)
>  		raw_nvram = false;
>  	} else {
>  		data = bcm47xx_nvram_get_contents(&data_len);
> -		if (!data && !(fwctx->flags & BRCMF_FW_REQ_NV_OPTIONAL))
> -			goto fail;
> +		if (!data) {
> +			brcmf_dbg(TRACE, "Failed to get platform NVRAM\n");

Better make this INFO level instead of TRACE. The intent of TRACE level
is for entry/exit points in functions.

Regards,
Arend