linux-kernel - [PATCH v2] ACPI: PCI: Release excess memory usage.

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Message-ID: <20250429091051.249911-1-qiaozhe@iscas.ac.cn>
Date: Tue, 29 Apr 2025 17:10:51 +0800
From: Zhe Qiao <qiaozhe@...as.ac.cn>
To: rafael@...nel.org,
	lenb@...nel.org,
	bhelgaas@...gle.com,
	will@...nel.org,
	sunilvl@...tanamicro.com,
	qiaozhe@...as.ac.cn
Cc: linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] ACPI: PCI: Release excess memory usage.

In the pci_acpi_scan_root() function, if the PCI bus creation failed,
the allocated memory should be released to avoid memory occupation.

Fixes: 789befdfa389 ("arm64: PCI: Migrate ACPI related functions to pci-acpi.c")
Signed-off-by: Zhe Qiao <qiaozhe@...as.ac.cn>

---
V1 -> V2:
Modified labels for better readability.

---
 drivers/pci/pci-acpi.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index af370628e583..bde104ecac80 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -1677,15 +1677,12 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 
 	root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
 	if (!root_ops) {
-		kfree(ri);
-		return NULL;
+		goto free_ri;
 	}
 
 	ri->cfg = pci_acpi_setup_ecam_mapping(root);
 	if (!ri->cfg) {
-		kfree(ri);
-		kfree(root_ops);
-		return NULL;
+		goto free_root_ops;
 	}
 
 	root_ops->release_info = pci_acpi_generic_release_info;
@@ -1693,7 +1690,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 	root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
 	bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
 	if (!bus)
-		return NULL;
+		goto free_root_ops;
 
 	/* If we must preserve the resource configuration, claim now */
 	host = pci_find_host_bridge(bus);
@@ -1710,6 +1707,12 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 		pcie_bus_configure_settings(child);
 
 	return bus;
+
+free_root_ops:
+	kfree(root_ops);
+free_ri:
+	kfree(ri);
+	return NULL;
 }
 
 void pcibios_add_bus(struct pci_bus *bus)
-- 
2.43.0