linux-kernel - [PATCH] arm64: PCI: fix memleak when calling pci

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Date:   Sat, 5 Sep 2020 10:48:11 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <catalin.marinas@....com>, <will.deacon@....com>,
        <bhelgaas@...gle.com>, <gcherian@...vell.com>,
        <guohanjun@...wei.com>, <yangyingliang@...wei.com>
Subject: [PATCH] arm64: PCI: fix memleak when calling pci_iomap/unmap()

config GENERIC_IOMAP is disabled on arm64, so pci_iounmap() does
nothing, when we using pci_iomap/pci_iounmap(), it will lead to
memory leak. Implements pci_iounmap() for arm64 to fix this leak.

Fixes: 09a5723983e3 ("arm64: Use include/asm-generic/io.h")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 arch/arm64/include/asm/io.h | 5 +++++
 arch/arm64/kernel/pci.c     | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index ff50dd731852d..4d8da06ac295f 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -18,6 +18,11 @@
 #include <asm/alternative.h>
 #include <asm/cpufeature.h>
 
+#ifdef CONFIG_PCI
+struct pci_dev;
+#define pci_iounmap pci_iounmap
+extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
+#endif
 /*
  * Generic IO read/write.  These perform native-endian accesses.
  */
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 1006ed2d7c604..ddfa1c53def48 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -217,4 +217,9 @@ void pcibios_remove_bus(struct pci_bus *bus)
 	acpi_pci_remove_bus(bus);
 }
 
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+	iounmap(addr);
+}
+EXPORT_SYMBOL(pci_iounmap);
 #endif
-- 
2.25.1