linux-kernel - RE: [patch 06/10] PCI: hv: Switch MSI descriptor locking to guard()

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Message-ID:
 <BN7PR02MB41486406B36F615851374654D4D62@BN7PR02MB4148.namprd02.prod.outlook.com>
Date: Mon, 10 Mar 2025 20:33:38 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
CC: Marc Zyngier <maz@...nel.org>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei
 Liu <wei.liu@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, Nishanth Menon
	<nm@...com>, Tero Kristo <kristo@...nel.org>, Santosh Shilimkar
	<ssantosh@...nel.org>, Jon Mason <jdmason@...zu.us>, Dave Jiang
	<dave.jiang@...el.com>, Allen Hubbe <allenbh@...il.com>,
	"ntb@...ts.linux.dev" <ntb@...ts.linux.dev>, Wei Huang <wei.huang2@....com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, "James E.J.
 Bottomley" <James.Bottomley@...senPartnership.com>, "Martin K. Petersen"
	<martin.petersen@...cle.com>, "linux-scsi@...r.kernel.org"
	<linux-scsi@...r.kernel.org>
Subject: RE: [patch 06/10] PCI: hv: Switch MSI descriptor locking to guard()

From: Thomas Gleixner <tglx@...utronix.de> Sent: Sunday, March 9, 2025 12:42 AM
> 
> Convert the code to use the new guard(msi_descs_lock).
> 
> No functional change intended.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> Cc: Wei Liu <wei.liu@...nel.org>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: linux-hyperv@...r.kernel.org
> Cc: linux-pci@...r.kernel.org
> ---
>  drivers/pci/controller/pci-hyperv.c |   14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -3976,24 +3976,18 @@ static int hv_pci_restore_msi_msg(struct
>  {
>  	struct irq_data *irq_data;
>  	struct msi_desc *entry;
> -	int ret = 0;
> 
>  	if (!pdev->msi_enabled && !pdev->msix_enabled)
>  		return 0;
> 
> -	msi_lock_descs(&pdev->dev);
> +	guard(msi_descs_lock)(&pdev->dev);
>  	msi_for_each_desc(entry, &pdev->dev, MSI_DESC_ASSOCIATED) {
>  		irq_data = irq_get_irq_data(entry->irq);
> -		if (WARN_ON_ONCE(!irq_data)) {
> -			ret = -EINVAL;
> -			break;
> -		}
> -
> +		if (WARN_ON_ONCE(!irq_data))
> +			return -EINVAL;
>  		hv_compose_msi_msg(irq_data, &entry->msg);
>  	}
> -	msi_unlock_descs(&pdev->dev);
> -
> -	return ret;
> +	return 0;
>  }
> 

Reviewed-by: Michael Kelley <mhklinux@...look.com>