linux-kernel - Re: [PATCH v1] wifi: ath9k: fix AR9003 mac hardware hang check register offset calculation

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Message-ID: <87zg70kpmw.fsf@toke.dk>
Date:   Sat, 22 Apr 2023 15:33:43 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     Peter Seiderer <ps.report@....net>
Cc:     Simon Horman <simon.horman@...igine.com>,
        linux-wireless@...r.kernel.org, Kalle Valo <kvalo@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sujith Manoharan <c_manoha@....qualcomm.com>,
        "John W . Linville" <linville@...driver.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gregg Wonderly <greggwonderly@...techllc.com>
Subject: Re: [PATCH v1] wifi: ath9k: fix AR9003 mac hardware hang check
 register offset calculation

Peter Seiderer <ps.report@....net> writes:

> On Sat, 22 Apr 2023 12:18:03 +0200, Toke Høiland-Jørgensen <toke@...e.dk> wrote:
>
>> Simon Horman <simon.horman@...igine.com> writes:
>> 
>> > On Thu, Apr 20, 2023 at 10:43:16PM +0200, Peter Seiderer wrote:  
>> >> Fix ath9k_hw_verify_hang()/ar9003_hw_detect_mac_hang() register offset
>> >> calculation (do not overflow the shift for the second register/queues
>> >> above five, use the register layout described in the comments above
>> >> ath9k_hw_verify_hang() instead).
>> >> 
>> >> Fixes: 222e04830ff0 ("ath9k: Fix MAC HW hang check for AR9003")
>> >> 
>> >> Reported-by: Gregg Wonderly <greggwonderly@...techllc.com>
>> >> Link: https://lore.kernel.org/linux-wireless/E3A9C354-0CB7-420C-ADEF-F0177FB722F4@seqtechllc.com/
>> >> Signed-off-by: Peter Seiderer <ps.report@....net>
>> >> ---
>> >> Notes:
>> >>   - tested with MikroTik R11e-5HnD/Atheros AR9300 Rev:4 (lspci: 168c:0033
>> >>     Qualcomm Atheros AR958x 802.11abgn Wireless Network Adapter (rev 01))
>> >>     card
>> >> ---
>> >>  drivers/net/wireless/ath/ath9k/ar9003_hw.c | 27 ++++++++++++++--------
>> >>  1 file changed, 18 insertions(+), 9 deletions(-)
>> >> 
>> >> diff --git a/drivers/net/wireless/ath/ath9k/ar9003_hw.c b/drivers/net/wireless/ath/ath9k/ar9003_hw.c
>> >> index 4f27a9fb1482..0ccf13a35fb4 100644
>> >> --- a/drivers/net/wireless/ath/ath9k/ar9003_hw.c
>> >> +++ b/drivers/net/wireless/ath/ath9k/ar9003_hw.c
>> >> @@ -1099,17 +1099,22 @@ static bool ath9k_hw_verify_hang(struct ath_hw *ah, unsigned int queue)
>> >>  {
>> >>  	u32 dma_dbg_chain, dma_dbg_complete;
>> >>  	u8 dcu_chain_state, dcu_complete_state;
>> >> +	unsigned int dbg_reg, reg_offset;
>> >>  	int i;
>> >>  
>> >> -	for (i = 0; i < NUM_STATUS_READS; i++) {
>> >> -		if (queue < 6)
>> >> -			dma_dbg_chain = REG_READ(ah, AR_DMADBG_4);
>> >> -		else
>> >> -			dma_dbg_chain = REG_READ(ah, AR_DMADBG_5);
>> >> +	if (queue < 6) {
>> >> +		dbg_reg = AR_DMADBG_4;
>> >> +		reg_offset = i * 5;  
>> >
>> > Hi Peter,
>> >
>> > unless my eyes are deceiving me, i is not initialised here.  
>> 
>> Nice catch! Hmm, I wonder why my test compile didn't complain about
>> that? Or maybe it did and I overlooked it? Anyway, Kalle, I already
>> delegated this patch to you in patchwork, so please drop it and I'll try
>> to do better on reviewing the next one :)
>
> No warning reported because of Makefile:
>
>   1038 # Enabled with W=2, disabled by default as noisy
>   1039 ifdef CONFIG_CC_IS_GCC
>   1040 KBUILD_CFLAGS += -Wno-maybe-uninitialized
>   1041 endif

Ah, I see! Right then, that explains it :)

-Toke