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[ARM] 4568/1: fix l2x0 cache invalidate handling of unaligned addresses

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The l2x0_inv_range() function doesn't handle unaligned addresses
correctly. It's necessary to clean the cache lines that are at the
start and end of the invalidate range, if the addresses are not aligned,
to prevent corruption of other data sharing the same cache line.

Signed-off-by: Rui Sousa <rui.p.m.sousa@gmail.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rui Sousa 2007-09-15 00:56:19 +01:00 committed by Russell King
parent c2f828977b
commit 4f6627ac3b
1 changed files with 11 additions and 1 deletions
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12
arch/arm/mm/cache-l2x0.c
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@ -57,7 +57,17 @@ static void l2x0_inv_range(unsigned long start, unsigned long end)
{
unsigned long addr;
start &= ~(CACHE_LINE_SIZE - 1);
if (start & (CACHE_LINE_SIZE - 1)) {
start &= ~(CACHE_LINE_SIZE - 1);
sync_writel(start, L2X0_CLEAN_INV_LINE_PA, 1);
start += CACHE_LINE_SIZE;
}
if (end & (CACHE_LINE_SIZE - 1)) {
end &= ~(CACHE_LINE_SIZE - 1);
sync_writel(end, L2X0_CLEAN_INV_LINE_PA, 1);
}
for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
sync_writel(addr, L2X0_INV_LINE_PA, 1);
cache_sync();