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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2005-10-19 19:57:14 +0900
committerRalf Baechle <ralf@linux-mips.org>2005-10-29 19:32:44 +0100
commit750ccf687ff9adbf2a16066a3a2757d0f761384c (patch)
tree935c776cb9927f34b7038247249e4de68c93a562
parentf4c72cc737561aab0d9c7f877abbc0a853f1c465 (diff)
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Fix zero length sys_cacheflush
Cacheflush(0, 0, 0) was crashing the system. This is because flush_icache_range(start, end) tries to flushing whole address space (0 - ~0UL) if both start and end are zero. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/mm/cache.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 611b48d..314701a 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -56,6 +56,8 @@ EXPORT_SYMBOL(_dma_cache_inv);
asmlinkage int sys_cacheflush(unsigned long __user addr,
unsigned long bytes, unsigned int cache)
{
+ if (bytes == 0)
+ return 0;
if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
return -EFAULT;