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Subject: Re: [patch V2 26/36] net: brcmfmac: Convey execution context via
 argument to brcmf_netif_rx()
To:     Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Paul McKenney <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        Christian Benvenuti <benve@cisco.com>,
        Govindarajulu Varadarajan <_govind@gmx.com>,
        Dave Miller <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org,
        Jonathan Corbet <corbet@lwn.net>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        linux-doc@vger.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
        Jay Cliburn <jcliburn@gmail.com>,
        Chris Snook <chris.snook@gmail.com>,
        Vishal Kulkarni <vishal@chelsio.com>,
        Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
        intel-wired-lan@lists.osuosl.org,
        Shannon Nelson <snelson@pensando.io>,
        Pensando Drivers <drivers@pensando.io>,
        Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
        Edward Cree <ecree@solarflare.com>,
        Martin Habets <mhabets@solarflare.com>,
        Jon Mason <jdmason@kudzu.us>, Daniel Drake <dsd@gentoo.org>,
        Ulrich Kunitz <kune@deine-taler.de>,
        Kalle Valo <kvalo@codeaurora.org>,
        linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
        Wright Feng <wright.feng@cypress.com>,
        brcm80211-dev-list.pdl@broadcom.com,
        brcm80211-dev-list@cypress.com,
        Stanislav Yakovlev <stas.yakovlev@gmail.com>,
        Stanislaw Gruszka <stf_xl@wp.pl>,
        Johannes Berg <johannes.berg@intel.com>,
        Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
        Luca Coelho <luciano.coelho@intel.com>,
        Intel Linux Wireless <linuxwifi@intel.com>,
        Jouni Malinen <j@w1.fi>,
        Amitkumar Karwar <amitkarwar@gmail.com>,
        Ganapathi Bhat <ganapathi.bhat@nxp.com>,
        Xinming Hu <huxinming820@gmail.com>,
        libertas-dev@lists.infradead.org,
        Pascal Terjan <pterjan@google.com>,
        Ping-Ke Shih <pkshih@realtek.com>
References: <20200929202509.673358734@linutronix.de>
 <20200929203502.084703195@linutronix.de>
From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <0f26e8be-bfb1-7e69-3a8d-a5ef2bf22b25@broadcom.com>
Date:   Wed, 30 Sep 2020 00:03:59 +0200
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On 9/29/2020 10:25 PM, Thomas Gleixner wrote:
> bcrmgf_netif_rx() uses in_interrupt to chose between netif_rx() and
> netif_rx_ni(). in_interrupt() usage in drivers is phased out.
> 
> Convey the execution mode via an 'inirq' argument through the various
> callchains leading to brcmf_netif_rx():
> 
> brcmf_pcie_isr_thread()		    <- Task context
>    brcmf_proto_msgbuf_rx_trigger()
>      brcmf_msgbuf_process_rx()
>        brcmf_msgbuf_process_msgtype()
>          brcmf_msgbuf_process_rx_complete()
> 	  brcmf_netif_mon_rx()
> 	     brcmf_netif_rx(isirq = false)
> 	  brcmf_netif_rx(isirq = false)
> 
> brcmf_sdio_readframes()  <- Task context sdio_claim_host() might sleep
>    brcmf_rx_frame(isirq = false)
> 
> brcmf_sdio_rxglom()      <- Task context sdio_claim_host() might sleep
>    brcmf_rx_frame(isirq = false)
> 
> brcmf_usb_rx_complete()  <- Interrupt context
>    brcmf_rx_frame(isirq = true)
> 
> brcmf_rx_frame()
>    brcmf_proto_rxreorder()
>      brcmf_proto_bcdc_rxreorder()
>        brcmf_fws_rxreorder()
>          brcmf_netif_rx()
>        brcmf_netif_rx()

Thanks for taking the dive.

Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> ---
> V2: New patch. Using an argument instead of switching to netif_rx_any_context()
> ---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c     |    4 +--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h      |    3 +-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c     |   16 ++++++------
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h     |    2 -
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c |   10 +++----
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.h |    2 -
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c   |    5 ++-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/proto.h    |    6 ++--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c     |    4 +--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c      |    2 -
>   10 files changed, 29 insertions(+), 25 deletions(-)

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