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x86: PAT bug fix for attribute type check after reserve_memtype

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Bug fixes for reserve_memtype() call in __ioremap and pci_mmap_page_range().
If reserve_memtype returns non-zero, then it is an error and subsequent free is
not required. Requested and returned prot value check should be done when
reserve_memtype returns success.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Venki Pallipadi 2008-03-24 14:39:55 -07:00 committed by Ingo Molnar
parent 9307cacad0
commit dee7cbb210
2 changed files with 15 additions and 3 deletions
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11
arch/x86/mm/ioremap.c
View File

@ -124,6 +124,7 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size,
struct vm_struct *area;
unsigned long new_prot_val;
pgprot_t prot;
int retval;
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
@ -163,8 +164,14 @@ static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size,
phys_addr &= PAGE_MASK;
size = PAGE_ALIGN(last_addr+1) - phys_addr;
if (reserve_memtype(phys_addr, phys_addr + size,
prot_val, &new_prot_val)) {
retval = reserve_memtype(phys_addr, phys_addr + size,
prot_val, &new_prot_val);
if (retval) {
printk("reserve_memtype returned %d\n", retval);
return NULL;
}
if (prot_val != new_prot_val) {
/*
* Do not fallback to certain memory types with certain
* requested type:

7
arch/x86/pci/i386.c
View File

@ -328,6 +328,7 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
unsigned long len = vma->vm_end - vma->vm_start;
unsigned long flags;
unsigned long new_flags;
int retval;
/* I/O space cannot be accessed via normal processor loads and
* stores on this platform.
@ -344,7 +345,11 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
vma->vm_page_prot = __pgprot(prot);
flags = pgprot_val(vma->vm_page_prot) & _PAGE_CACHE_MASK;
if (reserve_memtype(addr, addr + len, flags, &new_flags)) {
retval = reserve_memtype(addr, addr + len, flags, &new_flags);
if (retval)
return retval;
if (flags != new_flags) {
/*
* Do not fallback to certain memory types with certain
* requested type: