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Subject: Re: [patch V2 27/36] net: brcmfmac: Convey allocation mode as
 argument
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>
 <20200929203502.180883992@linutronix.de>
From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <d64a84f6-2ae6-ab26-e7a7-969f45b8cfb8@broadcom.com>
Date:   Wed, 30 Sep 2020 00:07:30 +0200
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On 9/29/2020 10:25 PM, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> 
> The usage of in_interrupt() in drivers is phased out and Linus clearly
> requested that code which changes behaviour depending on context should
> either be seperated or the context be conveyed in an argument passed by the
> caller, which usually knows the context.
> 
> brcmf_fweh_process_event() uses in_interrupt() to select the allocation
> mode GFP_KERNEL/GFP_ATOMIC. Aside of the above reasons this check is
> incomplete as it cannot detect contexts which just have preemption or
> interrupts disabled.
> 
> All callchains leading to brcmf_fweh_process_event() can clearly identify
> the calling context. Convey a 'gfp' argument through the callchains and let
> the callers hand in the appropriate GFP mode.
> 
> This has also the advantage that any change of execution context or
> preemption/interrupt state in these callchains will be detected by the
> memory allocator for all GFP_KERNEL allocations.

Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> V2: Adopt to the 'inirq' changes
> ---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c   |   10 ++++++----
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c   |    8 ++------
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.h   |    7 ++++---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c |    2 +-
>   4 files changed, 13 insertions(+), 14 deletions(-)

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