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BLOCK: Fix bounce limit address check

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This fixes some OOMs on 64bit systems with <4GB of RAM when accessing
the cdrom.

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: Andi Kleen <ak@suse.de>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
This commit is contained in:
Andi Kleen
2006-08-07 21:26:18 +02:00
committed by Adrian Bunk
parent ad29cb6531
commit 3d6cf29b3f
1 changed files with 1 additions and 1 deletions
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block/ll_rw_blk.c
+1 -1
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@@ -637,7 +637,7 @@ 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