linux-kernel - Re: [PATCH 1/1] PCI/bwctrl: Remove IRQF

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Message-ID: <20241115210217.GA2057245@bhelgaas>
Date: Fri, 15 Nov 2024 15:02:17 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Stefan Wahren <wahrenst@....net>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Lukas Wunner <lukas@...ner.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] PCI/bwctrl: Remove IRQF_ONESHOT and handle hardirqs
 instead

On Fri, Nov 15, 2024 at 06:57:17PM +0200, Ilpo Järvinen wrote:
> bwctrl cannot use IRQF_ONESHOT because it shares interrupt with other
> service drivers that are not using IRQF_ONESHOT nor compatible with it.
> 
> Remove IRQF_ONESHOT from bwctrl and convert the irq thread to hardirq
> handler. Rename the handler to pcie_bwnotif_irq() to indicate its new
> purpose.
> 
> The IRQ handler is simple enough to not require not require other
> changes.
> 
> Fixes: 058a4cb11620 ("PCI/bwctrl: Re-add BW notification portdrv as PCIe BW controller")
> Reported-by: Stefan Wahren <wahrenst@....net>
> Link: https://lore.kernel.org/linux-pci/dcd660fd-a265-4f47-8696-776a85e097a0@gmx.net/
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Squashed into 058a4cb11620, thanks!

Also added your tested-by, Stefan, thanks very much for doing that!

> ---
>  drivers/pci/pcie/bwctrl.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/bwctrl.c b/drivers/pci/pcie/bwctrl.c
> index ff5d12e01f9c..a6c65bbe3735 100644
> --- a/drivers/pci/pcie/bwctrl.c
> +++ b/drivers/pci/pcie/bwctrl.c
> @@ -230,7 +230,7 @@ static void pcie_bwnotif_disable(struct pci_dev *port)
>  				   PCI_EXP_LNKCTL_LBMIE | PCI_EXP_LNKCTL_LABIE);
>  }
>  
> -static irqreturn_t pcie_bwnotif_irq_thread(int irq, void *context)
> +static irqreturn_t pcie_bwnotif_irq(int irq, void *context)
>  {
>  	struct pcie_device *srv = context;
>  	struct pcie_bwctrl_data *data = srv->port->link_bwctrl;
> @@ -302,10 +302,8 @@ static int pcie_bwnotif_probe(struct pcie_device *srv)
>  	if (ret)
>  		return ret;
>  
> -	ret = devm_request_threaded_irq(&srv->device, srv->irq, NULL,
> -					pcie_bwnotif_irq_thread,
> -					IRQF_SHARED | IRQF_ONESHOT,
> -					"PCIe bwctrl", srv);
> +	ret = devm_request_irq(&srv->device, srv->irq, pcie_bwnotif_irq,
> +			       IRQF_SHARED, "PCIe bwctrl", srv);
>  	if (ret)
>  		return ret;
>  
> -- 
> 2.39.5
>