path: root/block
diff options
authorAndi Kleen <ak@suse.de>2006-06-21 14:48:09 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-06-23 17:10:39 +0200
commit8269730b389d4793348d521140f9c76fb1828249 (patch)
treec10c9441a16265f698dd4a38014c9d3026ee07c0 /block
parentdd67d051529387f6e44d22d1d5540ef281965fdd (diff)
[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')
1 files changed, 1 insertions, 1 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 2270bb45138..0603ab2f369 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;