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Blackfin: no-mpu: fix masking of small uncached dma region 

When using an uncached DMA region less than 1 MiB, we try to mask off
the whole last 1 MiB for it.  Unfortunately, this fails as we forgot
to subtract one from the calculated mask, leading to the region still
be marked as cacheable.

Reported-by: Andrew Rook <andrew.rook@speakerbus.co.uk>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Sonic Zhang 2010-11-04 08:01:37 +00:00 committed by Mike Frysinger
parent 36e11ab23e
commit 398834330c
1 changed files with 1 additions and 1 deletions
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2
arch/blackfin/kernel/cplb-nompu/cplbinit.c
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@ -116,7 +116,7 @@ void __init generate_cplb_tables_all(void)
((_ramend - uncached_end) >= 1 * 1024 * 1024))
dcplb_bounds[i_d].eaddr = uncached_end;
else
dcplb_bounds[i_d].eaddr = uncached_end & ~(1 * 1024 * 1024);
dcplb_bounds[i_d].eaddr = uncached_end & ~(1 * 1024 * 1024 - 1);
dcplb_bounds[i_d++].data = SDRAM_DGENERIC;
/* DMA uncached region. */
if (DMA_UNCACHED_REGION) {