netdev - Re: [patch 12/14] PCI: hv: Use tasklet_disable_in

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Message-ID: <20210310113413.cuvmnrd3vhyhzi4c@liuwe-devbox-debian-v2>
Date:   Wed, 10 Mar 2021 11:34:13 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        ath9k-devel@....qualcomm.com, Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, Chas Williams <3chas3@...il.com>,
        linux-atm-general@...ts.sourceforge.net,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net
Subject: Re: [patch 12/14] PCI: hv: Use tasklet_disable_in_atomic()

On Tue, Mar 09, 2021 at 09:42:15AM +0100, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> The hv_compose_msi_msg() callback in irq_chip::irq_compose_msi_msg is
> invoked via irq_chip_compose_msi_msg(), which itself is always invoked from
> atomic contexts from the guts of the interrupt core code.
> 
> There is no way to change this w/o rewriting the whole driver, so use
> tasklet_disable_in_atomic() which allows to make tasklet_disable()
> sleepable once the remaining atomic users are addressed.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Wei Liu <wei.liu@...nel.org>