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

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Message-ID: <20230422152234.639fc98e@gmx.net>
Date:   Sat, 22 Apr 2023 15:22:34 +0200
From:   Peter Seiderer <ps.report@....net>
To:     Toke Høiland-Jørgensen <toke@...e.dk>
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

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

Regards,
Peter

> 
> -Toke