diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2008-02-17 01:34:25 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-02-19 20:01:31 +0300 |
| commit | 9a74b3eb22f2d67a5681301f52aca5b7703382c8 (patch) | |
| tree | 3ef7b8713edfccc96ad1ce57a431828656d92d82 /arch/mips/mm/init.c | |
| parent | c42d95d6c49ce9c678a9d10aeb3f526c850d66dc (diff) | |
| download | linux-9a74b3eb22f2d67a5681301f52aca5b7703382c8.tar.xz | |
[MIPS] Fix buggy invocations of kmap_coherent()
kmap_coherent will only work correctly if the page it is called on is
not marked dirty. If it's dirty the kernel address of the page should
be used instead of a temporary mapping.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/init.c')
| -rw-r--r-- | arch/mips/mm/init.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 480dec04f552..c7aed133d11d 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -211,7 +211,8 @@ void copy_user_highpage(struct page *to, struct page *from, void *vfrom, *vto; vto = kmap_atomic(to, KM_USER1); - if (cpu_has_dc_aliases && page_mapped(from)) { + if (cpu_has_dc_aliases && + page_mapped(from) && !Page_dcache_dirty(from)) { vfrom = kmap_coherent(from, vaddr); copy_page(vto, vfrom); kunmap_coherent(); @@ -234,7 +235,8 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases && page_mapped(page)) { + if (cpu_has_dc_aliases && + page_mapped(page) && !Page_dcache_dirty(page)) { void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(vto, src, len); kunmap_coherent(); @@ -253,7 +255,8 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases && page_mapped(page)) { + if (cpu_has_dc_aliases && + page_mapped(page) && !Page_dcache_dirty(page)) { void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(dst, vfrom, len); kunmap_coherent(); |