linux-kernel - Re: [PATCH] PCI: dwc/host: Mark PCIe/PCI (MSI) cascade ISR as IRQF_NO

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Message-ID: <20170523185718.GC2637@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 23 May 2017 13:57:18 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jisheng Zhang <jszhang@...vell.com>
Cc:     bhelgaas@...gle.com, jingoohan1@...il.com, Joao.Pinto@...opsys.com,
        svarbanov@...sol.com, keith.busch@...el.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] PCI: dwc/host: Mark PCIe/PCI (MSI) cascade ISR as
 IRQF_NO_THREAD

On Thu, Apr 20, 2017 at 06:27:18PM +0800, Jisheng Zhang wrote:
> Similar as commit 8ff0ef996ca0 ("PCI: host: Mark PCIe/PCI (MSI) IRQ
> cascade handlers as IRQF_NO_THREAD"), we should mark PCIe/PCI (MSI)
> IRQ cascade handlers IRQF_NO_THREAD explicitly. I just found this
> issue in pcie-designware-plat driver, then searched the code, I think
> we should fix pcie-qcom and vmd as well.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>

Applied with ack/reviewed-by from Jingoo and Keith to pci/host-designware
for v4.13, thanks!

> ---
>  drivers/pci/dwc/pcie-designware-plat.c | 3 ++-
>  drivers/pci/dwc/pcie-qcom.c            | 3 ++-
>  drivers/pci/host/vmd.c                 | 3 ++-
>  3 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
> index f20d494922ab..0db1dafc82bb 100644
> --- a/drivers/pci/dwc/pcie-designware-plat.c
> +++ b/drivers/pci/dwc/pcie-designware-plat.c
> @@ -67,7 +67,8 @@ static int dw_plat_add_pcie_port(struct pcie_port *pp,
>  
>  		ret = devm_request_irq(dev, pp->msi_irq,
>  					dw_plat_pcie_msi_irq_handler,
> -					IRQF_SHARED, "dw-plat-pcie-msi", pp);
> +					IRQF_SHARED | IRQF_NO_THREAD,
> +					"dw-plat-pcie-msi", pp);
>  		if (ret) {
>  			dev_err(dev, "failed to request MSI IRQ\n");
>  			return ret;
> diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c
> index 67eb7f5926dd..a5570c58081e 100644
> --- a/drivers/pci/dwc/pcie-qcom.c
> +++ b/drivers/pci/dwc/pcie-qcom.c
> @@ -727,7 +727,8 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  
>  		ret = devm_request_irq(dev, pp->msi_irq,
>  				       qcom_pcie_msi_irq_handler,
> -				       IRQF_SHARED, "qcom-pcie-msi", pp);
> +				       IRQF_SHARED | IRQF_NO_THREAD,
> +				       "qcom-pcie-msi", pp);
>  		if (ret) {
>  			dev_err(dev, "cannot request msi irq\n");
>  			return ret;
> diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
> index e27ad2a3bd33..784f63beb487 100644
> --- a/drivers/pci/host/vmd.c
> +++ b/drivers/pci/host/vmd.c
> @@ -704,7 +704,8 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  
>  		INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
>  		err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
> -				       vmd_irq, 0, "vmd", &vmd->irqs[i]);
> +				       vmd_irq, IRQF_NO_THREAD,
> +				       "vmd", &vmd->irqs[i]);
>  		if (err)
>  			return err;
>  	}
> -- 
> 2.11.0
>