linux-kernel - [PATCH] arch/i386/kernel/pci-dma.c: ioremap balanced with iounmap

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Date:	Tue, 17 Oct 2006 10:02:50 +0530
From:	Amol Lad <amol@...ismonetworks.com>
To:	gregkh@...e.de
Cc:	linux kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] arch/i386/kernel/pci-dma.c: ioremap balanced with iounmap

ioremap must be balanced by an iounmap and failing to do so can result
in a memory leak.

Tested (compilation only):
- using allmodconfig
- making sure the files are compiling without any warning/error due to
new changes

Signed-off-by: Amol Lad <amol@...ismonetworks.com>
---
diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/arch/i386/kernel/pci-dma.c linux-2.6.19-rc1/arch/i386/kernel/pci-dma.c
--- linux-2.6.19-rc1-orig/arch/i386/kernel/pci-dma.c	2006-08-24 02:46:33.000000000 +0530
+++ linux-2.6.19-rc1/arch/i386/kernel/pci-dma.c	2006-10-05 18:36:39.000000000 +0530
@@ -75,7 +75,7 @@ EXPORT_SYMBOL(dma_free_coherent);
 int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 				dma_addr_t device_addr, size_t size, int flags)
 {
-	void __iomem *mem_base;
+	void __iomem *mem_base = NULL;
 	int pages = size >> PAGE_SHIFT;
 	int bitmap_size = (pages + 31)/32;
 
@@ -114,6 +114,8 @@ int dma_declare_coherent_memory(struct d
  free1_out:
 	kfree(dev->dma_mem->bitmap);
  out:
+	if (mem_base)
+		iounmap(mem_base);
 	return 0;
 }
 EXPORT_SYMBOL(dma_declare_coherent_memory);


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