linux-kernel - Re: [PATCH] ath9k: Check for errors when reading SREV register

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Message-Id: <20190429145322.9ADFB608BA@smtp.codeaurora.org>
Date:   Mon, 29 Apr 2019 14:53:22 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Tim Schumacher <timschumi@....de>
Cc:     unlisted-recipients:; (no To-header on input) timschumi@....de,
        QCA ath9k Development <ath9k-devel@....qualcomm.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ath9k: Check for errors when reading SREV register

Tim Schumacher <timschumi@....de> wrote:

> Right now, if an error is encountered during the SREV register
> read (i.e. an EIO in ath9k_regread()), that error code gets
> passed all the way to __ath9k_hw_init(), where it is visible
> during the "Chip rev not supported" message.
> 
>     ath9k_htc 1-1.4:1.0: ath9k_htc: HTC initialized with 33 credits
>     ath: phy2: Mac Chip Rev 0x0f.3 is not supported by this driver
>     ath: phy2: Unable to initialize hardware; initialization status: -95
>     ath: phy2: Unable to initialize hardware; initialization status: -95
>     ath9k_htc: Failed to initialize the device
> 
> Check for -EIO explicitly in ath9k_hw_read_revisions() and return
> a boolean based on the success of the operation. Check for that in
> __ath9k_hw_init() and abort with a more debugging-friendly message
> if reading the revisions wasn't successful.
> 
>     ath9k_htc 1-1.4:1.0: ath9k_htc: HTC initialized with 33 credits
>     ath: phy2: Failed to read SREV register
>     ath: phy2: Could not read hardware revision
>     ath: phy2: Unable to initialize hardware; initialization status: -95
>     ath: phy2: Unable to initialize hardware; initialization status: -95
>     ath9k_htc: Failed to initialize the device
> 
> This helps when debugging by directly showing the first point of
> failure and it could prevent possible errors if a 0x0f.3 revision
> is ever supported.
> 
> Signed-off-by: Tim Schumacher <timschumi@....de>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

2f90c7e5d094 ath9k: Check for errors when reading SREV register

-- 
https://patchwork.kernel.org/patch/10858399/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches