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Fix zero length sys_cacheflush

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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>
This commit is contained in:
Atsushi Nemoto 2005-10-19 19:57:14 +09:00 committed by Ralf Baechle
parent f4c72cc737
commit 750ccf687f
1 changed files with 2 additions and 0 deletions
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2
arch/mips/mm/cache.c
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@ -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;