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| author | Malahal Naineni <malahal@us.ibm.com> | 2010-10-01 14:45:27 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-10-01 14:45:27 +0200 |
| commit | efb012b361cf9319cd86ff169afa7550b7aa9336 (patch) | |
| tree | e8c0027db29ec3898d835ca0fa6efab93d86b9bd /block/blk-settings.c | |
| parent | 260a67a9e534f0c7d49ddd6451833d54ba39ac81 (diff) | |
| download | lwn-efb012b361cf9319cd86ff169afa7550b7aa9336.tar.gz lwn-efb012b361cf9319cd86ff169afa7550b7aa9336.zip | |
block: set the bounce_pfn to the actual DMA limit rather than to max memory
The bounce_pfn of the request queue in 64 bit systems is set to the
current max_low_pfn. Adding more memory later makes this incorrect.
Memory allocated beyond this boot time max_low_pfn appear to require
bounce buffers (bounce buffers are actually not allocated but used in
calculating segments that may result in "over max segments limit"
errors).
Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-settings.c')
| -rw-r--r-- | block/blk-settings.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index f8f2ddf20613..a3600a7ab8bb 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -214,7 +214,7 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_mask) */ if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) dma = 1; - q->limits.bounce_pfn = max_low_pfn; + q->limits.bounce_pfn = max(max_low_pfn, b_pfn); #else if (b_pfn < blk_max_low_pfn) dma = 1; |