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

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Message-ID: <eb1da92d-b7b7-43ae-959e-3f02c6e2c91d@gmx.net>
Date: Fri, 15 Nov 2024 19:29:31 +0100
From: Stefan Wahren <wahrenst@....net>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 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

Hi,

Am 15.11.24 um 17:57 schrieb Ilpo Järvinen:
> 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>
this fixed the probing issue. Thanks

Tested-by: Stefan Wahren <wahrenst@....net>

Is there anything more I can/should test?

> ---
>   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;
>