linux-kernel - [patch V4 07/14] PCI/MSI: Use _

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Message-ID: <20250319105506.444764312@linutronix.de>
Date: Wed, 19 Mar 2025 11:56:50 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Marc Zyngier <maz@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Nishanth Menon <nm@...com>,
 Dhruva Gole <d-gole@...com>,
 Tero Kristo <kristo@...nel.org>,
 Santosh Shilimkar <ssantosh@...nel.org>,
 Logan Gunthorpe <logang@...tatee.com>,
 Dave Jiang <dave.jiang@...el.com>,
 Jon Mason <jdmason@...zu.us>,
 Allen Hubbe <allenbh@...il.com>,
 ntb@...ts.linux.dev,
 Michael Kelley <mhklinux@...look.com>,
 Wei Liu <wei.liu@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>,
 linux-hyperv@...r.kernel.org,
 linux-pci@...r.kernel.org,
 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,
 Jonathan Cameron <Jonathan.Cameron@...ei.com>
Subject: [patch V4 07/14] PCI/MSI: Use __free() for affinity masks

Let cleanup handle the freeing of the affinity mask. That prepares for
switching the MSI descriptor locking to a guard().

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V4: Split out of the previous combo patch
---
 drivers/pci/msi/msi.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -351,7 +351,6 @@ static int msi_verify_entries(struct pci
 static int msi_capability_init(struct pci_dev *dev, int nvec,
 			       struct irq_affinity *affd)
 {
-	struct irq_affinity_desc *masks = NULL;
 	struct msi_desc *entry, desc;
 	int ret;

@@ -362,8 +361,8 @@ static int msi_capability_init(struct pc
 	/* Disable MSI during setup in the hardware to erase stale state */
 	pci_msi_set_enable(dev, 0);

-	if (affd)
-		masks = irq_create_affinity_masks(nvec, affd);
+	struct irq_affinity_desc *masks __free(kfree) =
+		affd ? irq_create_affinity_masks(nvec, affd) : NULL;

 	msi_lock_descs(&dev->dev);
 	ret = msi_setup_msi_desc(dev, nvec, masks);
@@ -403,7 +402,6 @@ static int msi_capability_init(struct pc
 	pci_free_msi_irqs(dev);
 unlock:
 	msi_unlock_descs(&dev->dev);
-	kfree(masks);
 	return ret;
 }

@@ -664,12 +662,10 @@ static void msix_mask_all(void __iomem *
 static int msix_setup_interrupts(struct pci_dev *dev, struct msix_entry *entries,
 				 int nvec, struct irq_affinity *affd)
 {
-	struct irq_affinity_desc *masks = NULL;
+	struct irq_affinity_desc *masks __free(kfree) =
+		affd ? irq_create_affinity_masks(nvec, affd) : NULL;
 	int ret;

-	if (affd)
-		masks = irq_create_affinity_masks(nvec, affd);
-
 	msi_lock_descs(&dev->dev);
 	ret = msix_setup_msi_descs(dev, entries, nvec, masks);
 	if (ret)
@@ -691,7 +687,6 @@ static int msix_setup_interrupts(struct
 	pci_free_msi_irqs(dev);
 out_unlock:
 	msi_unlock_descs(&dev->dev);
-	kfree(masks);
 	return ret;
 }