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[MIPS] Fix buggy invocations of kmap_coherent()

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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>
This commit is contained in:
Ralf Baechle
2008-02-16 22:34:25 +00:00
parent c42d95d6c4
commit 9a74b3eb22
2 changed files with 16 additions and 8 deletions
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15
arch/mips/mm/cache.c
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@@ -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);
}
}