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[ARM] 4153/1: fix consistent_sync() off-by-one BUG check 

In consistent_sync(), start + size can end up pointing one byte
beyond the end of the direct RAM mapping.  We shouldn't BUG() when
this happens.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Lennert Buytenhek 2007-02-08 16:26:23 +01:00 committed by Russell King
parent 7ae5a761d2
commit 3e1a80f11f
1 changed files with 1 additions and 1 deletions
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2
arch/arm/mm/consistent.c
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@ -485,7 +485,7 @@ void consistent_sync(const void *start, size_t size, int direction)
{ {
const void *end = start + size; const void *end = start + size;
BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end)); BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end - 1));
switch (direction) { switch (direction) {
case DMA_FROM_DEVICE: /* invalidate only */ case DMA_FROM_DEVICE: /* invalidate only */