linux-kernel - Re: [PATCH] ath10k: Add interrupt summary based CE processing

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Date:   Tue,  1 Sep 2020 11:59:59 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Rakesh Pillai <pillair@...eaurora.org>
Cc:     ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rakesh Pillai <pillair@...eaurora.org>
Subject: Re: [PATCH] ath10k: Add interrupt summary based CE processing

Rakesh Pillai <pillair@...eaurora.org> wrote:

> Currently the NAPI processing loops through all
> the copy engines and processes a particular copy
> engine is the copy completion is set for that copy
> engine. The host driver is not supposed to access
> any copy engine register after clearing the interrupt
> status register.
> 
> This might result in kernel crash like the one below
> [ 1159.220143] Call trace:
> [ 1159.220170]  ath10k_snoc_read32+0x20/0x40 [ath10k_snoc]
> [ 1159.220193]  ath10k_ce_per_engine_service_any+0x78/0x130 [ath10k_core]
> [ 1159.220203]  ath10k_snoc_napi_poll+0x38/0x8c [ath10k_snoc]
> [ 1159.220270]  net_rx_action+0x100/0x3b0
> [ 1159.220312]  __do_softirq+0x164/0x30c
> [ 1159.220345]  run_ksoftirqd+0x2c/0x64
> [ 1159.220380]  smpboot_thread_fn+0x1b0/0x288
> [ 1159.220405]  kthread+0x11c/0x12c
> [ 1159.220423]  ret_from_fork+0x10/0x18
> 
> To avoid such a scenario, we generate an interrupt
> summary by reading the copy completion for all the
> copy engine before actually processing any of them.
> This will avoid reading the interrupt status register
> for any CE after the interrupt status is cleared.
> 
> Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1
> 
> Signed-off-by: Rakesh Pillai <pillair@...eaurora.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Tested-by: Douglas Anderson <dianders@...omium.org>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

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

b92aba35d39d ath10k: Add interrupt summary based CE processing

-- 
https://patchwork.kernel.org/patch/11628289/

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