linux-kernel - Re: [PATCH] PCI: qcom-ep: Fix disabling global

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Date:   Wed, 5 Oct 2022 12:35:29 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     lpieralisi@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, robh@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] PCI: qcom-ep: Fix disabling global_irq in error path

On Wed, Oct 05, 2022 at 07:28:52PM +0530, Manivannan Sadhasivam wrote:
> After commit 6a534df3da88 ("PCI: qcom-ep: Disable IRQs during driver
> remove"), the global irq is stored in the "global_irq" member of pcie_ep
> structure. This eliminates the need of local "irq" variable but that
> commit didn't remove the "irq" variable usage completely and it is still
> used for disable_irq() in error path which is wrong since the variable is
> uninitialized.
> 
> Fix this by removing the local "irq" variable and using
> "pcie_ep->global_irq" for disable_irq() in error path.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: 6a534df3da88 ("PCI: qcom-ep: Disable IRQs during driver remove")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

For today's "next" branch, I dropped 6a534df3da88 and the subsequent
patches.  Hopefully Lorenzo can squash this fix into 6a534df3da88.

I could clone the branch and squash it myself, but that's pretty
fiddly and I usually mess it up.

> ---
>  drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> index 16bb8f166c3b..00a0728d5ecd 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
> @@ -614,7 +614,7 @@ static irqreturn_t qcom_pcie_ep_perst_irq_thread(int irq, void *data)
>  static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
>  					     struct qcom_pcie_ep *pcie_ep)
>  {
> -	int irq, ret;
> +	int ret;
>  
>  	pcie_ep->global_irq = platform_get_irq_byname(pdev, "global");
>  	if (pcie_ep->global_irq < 0)
> @@ -637,7 +637,7 @@ static int qcom_pcie_ep_enable_irq_resources(struct platform_device *pdev,
>  					"perst_irq", pcie_ep);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Failed to request PERST IRQ\n");
> -		disable_irq(irq);
> +		disable_irq(pcie_ep->global_irq);
>  		return ret;
>  	}
>  
> -- 
> 2.25.1
>