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-rw-r--r--arch/x86/mm/ioremap.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index c004d94..1a88d15 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -116,7 +116,7 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
{
void __iomem *addr;
struct vm_struct *area;
- unsigned long offset, last_addr;
+ unsigned long pfn, offset, last_addr;
pgprot_t prot;
/* Don't allow wraparound or zero size */
@@ -133,9 +133,10 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
/*
* Don't allow anybody to remap normal RAM that we're using..
*/
- for (offset = phys_addr >> PAGE_SHIFT; offset < max_pfn_mapped &&
- (offset << PAGE_SHIFT) < last_addr; offset++) {
- if (page_is_ram(offset))
+ for (pfn = phys_addr >> PAGE_SHIFT; pfn < max_pfn_mapped &&
+ (pfn << PAGE_SHIFT) < last_addr; pfn++) {
+ if (page_is_ram(pfn) && pfn_valid(pfn) &&
+ !PageReserved(pfn_to_page(pfn)))
return NULL;
}