linux-kernel - [PATCH] x86: add missing free_memtype if get_vm_area

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Date:	Wed,  4 Nov 2009 14:48:09 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, venkatesh.pallipadi@...el.com,
	suresh.b.siddha@...el.com
Cc:	linux-kernel@...r.kernel.org, Xiaotian Feng <dfeng@...hat.com>
Subject: [PATCH] x86: add missing free_memtype if get_vm_area_caller failed

When __ioremap_caller goes into get_vm_area, kernel already reserved
memtype. so if get_vm_area fails, we need to free it before return.

Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
---
 arch/x86/mm/ioremap.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 334e63c..7859f77 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -196,8 +196,10 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
 	 * Ok, go for it..
 	 */
 	area = get_vm_area_caller(size, VM_IOREMAP, caller);
-	if (!area)
+	if (!area) {
+		free_memtype(phys_addr, phys_addr + size);
 		return NULL;
+	}
 	area->phys_addr = phys_addr;
 	vaddr = (unsigned long) area->addr;
 
-- 
1.6.2.5

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