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Date:   Tue, 9 Mar 2021 16:17:53 -0600
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Frederic Weisbecker <frederic@kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        "Ahmed S. Darwish" <a.darwish@linutronix.de>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Denis Kirjanov <kda@linux-powerpc.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org,
        ath9k-devel@qca.qualcomm.com, Kalle Valo <kvalo@codeaurora.org>,
        linux-wireless@vger.kernel.org, Chas Williams <3chas3@gmail.com>,
        linux-atm-general@lists.sourceforge.net,
        Stefan Richter <stefanr@s5r6.in-berlin.de>,
        linux1394-devel@lists.sourceforge.net
Subject: Re: [patch 12/14] PCI: hv: Use tasklet_disable_in_atomic()
Message-ID: <20210309221753.GA1930915@bjorn-Precision-5520>
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On Tue, Mar 09, 2021 at 09:42:15AM +0100, Thomas Gleixner wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.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@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: "K. Y. Srinivasan" <kys@microsoft.com>
> Cc: Haiyang Zhang <haiyangz@microsoft.com>
> Cc: Stephen Hemminger <sthemmin@microsoft.com>
> Cc: Wei Liu <wei.liu@kernel.org>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-hyperv@vger.kernel.org
> Cc: linux-pci@vger.kernel.org

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

It'd be ideal if you could merge this as a group.  Let me know if you
want me to do anything else.

> ---
>  drivers/pci/controller/pci-hyperv.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -1458,7 +1458,7 @@ static void hv_compose_msi_msg(struct ir
>  	 * Prevents hv_pci_onchannelcallback() from running concurrently
>  	 * in the tasklet.
>  	 */
> -	tasklet_disable(&channel->callback_event);
> +	tasklet_disable_in_atomic(&channel->callback_event);
>  
>  	/*
>  	 * Since this function is called with IRQ locks held, can't
>