[PATCH] x86: add missing free_memtype if get_vm_area_caller failed

[Xiaotian Feng]

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@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
---
 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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