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Date: Mon, 24 Mar 2008 14:39:55 -0700 From: Venki Pallipadi <venkatesh.pallipadi@...el.com> To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com> Cc: linux-kernel <linux-kernel@...r.kernel.org>, suresh.b.siddha@...el.com Subject: [PATCH] x86: PAT bug fix for attribute type check after reserve_memtype 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@...el.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com> --- arch/x86/mm/ioremap.c | 11 +++++++++-- arch/x86/pci/i386.c | 7 ++++++- 2 files changed, 15 insertions(+), 3 deletions(-) Index: linux-2.6-x86.git/arch/x86/mm/ioremap.c =================================================================== --- linux-2.6-x86.git.orig/arch/x86/mm/ioremap.c 2008-03-21 08:28:47.000000000 -0700 +++ linux-2.6-x86.git/arch/x86/mm/ioremap.c 2008-03-24 06:59:09.000000000 -0700 @@ -126,6 +126,7 @@ static void __iomem *__ioremap(unsigned unsigned long new_prot_val; pgprot_t prot; void __iomem *ret_addr; + int retval; /* Don't allow wraparound or zero size */ last_addr = phys_addr + size - 1; @@ -165,8 +166,14 @@ static void __iomem *__ioremap(unsigned 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: Index: linux-2.6-x86.git/arch/x86/pci/i386.c =================================================================== --- linux-2.6-x86.git.orig/arch/x86/pci/i386.c 2008-03-21 08:28:47.000000000 -0700 +++ linux-2.6-x86.git/arch/x86/pci/i386.c 2008-03-24 07:01:22.000000000 -0700 @@ -328,6 +328,7 @@ int pci_mmap_page_range(struct pci_dev * 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 * 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: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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