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| author | Andi Kleen <ak@suse.de> | 2006-06-21 14:48:09 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-06-23 17:10:39 +0200 |
| commit | 8269730b389d4793348d521140f9c76fb1828249 (patch) | |
| tree | c10c9441a16265f698dd4a38014c9d3026ee07c0 /block | |
| parent | dd67d051529387f6e44d22d1d5540ef281965fdd (diff) | |
| download | lwn-8269730b389d4793348d521140f9c76fb1828249.tar.gz lwn-8269730b389d4793348d521140f9c76fb1828249.zip | |
[BLOCK] Fix bounce limit address check
Do a safer check for when to enable DMA. Currently we enable ISA DMA
for cases that do not need it, resulting in OOM conditions when ZONE_DMA
runs out of space.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block')
| -rw-r--r-- | block/ll_rw_blk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 2270bb451385..0603ab2f3692 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -638,7 +638,7 @@ void blk_queue_bounce_limit(request_queue_t *q, u64 dma_addr) /* Assume anything <= 4GB can be handled by IOMMU. Actually some IOMMUs can handle everything, but I don't know of a way to test this here. */ - if (bounce_pfn < (0xffffffff>>PAGE_SHIFT)) + if (bounce_pfn < (min_t(u64,0xffffffff,BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1; q->bounce_pfn = max_low_pfn; #else |