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authorRalf Baechle <ralf@linux-mips.org>2008-02-16 22:34:25 +0000
committerRalf Baechle <ralf@linux-mips.org>2008-02-19 17:01:31 +0000
commit9a74b3eb22f2d67a5681301f52aca5b7703382c8 (patch)
tree3ef7b8713edfccc96ad1ce57a431828656d92d82 /arch/mips/mm/cache.c
parentc42d95d6c49ce9c678a9d10aeb3f526c850d66dc (diff)
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[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/cache.c')
-rw-r--r--arch/mips/mm/cache.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 81f30ac2bff9..6a24651971df 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -92,12 +92,17 @@ EXPORT_SYMBOL(__flush_dcache_page);
void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
- if (pages_do_alias((unsigned long)page_address(page), vmaddr)) {
- void *kaddr;
+ unsigned long addr = (unsigned long) page_address(page);
- kaddr = kmap_coherent(page, vmaddr);
- flush_data_cache_page((unsigned long)kaddr);
- kunmap_coherent();
+ if (pages_do_alias(addr, vmaddr)) {
+ if (page_mapped(page) && !Page_dcache_dirty(page)) {
+ void *kaddr;
+
+ kaddr = kmap_coherent(page, vmaddr);
+ flush_data_cache_page((unsigned long)kaddr);
+ kunmap_coherent();
+ } else
+ flush_data_cache_page(addr);
}
}