From 9a74b3eb22f2d67a5681301f52aca5b7703382c8 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Sat, 16 Feb 2008 22:34:25 +0000 Subject: [PATCH] [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 --- arch/mips/mm/cache.c | 15 ++++++++++----- arch/mips/mm/init.c | 9 ++++++--- 2 files changed, 16 insertions(+), 8 deletions(-) diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c index 81f30ac2bff..6a24651971d 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); } } diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 480dec04f55..c7aed133d11 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(); -- 2.20.1