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NVMe: Fix off-by-one when filling in PRP lists

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If the last element in the PRP list fits on the end of the page, there's
no need to allocate an extra page to put that single element in.  It can
fit on the end of the page.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2011-03-16 16:43:40 -04:00
parent ac88c36a38
commit 7523d834dd
1 changed files with 4 additions and 3 deletions
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7
drivers/block/nvme.c
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@ -376,12 +376,13 @@ static struct nvme_prps *nvme_setup_prps(struct nvme_dev *dev,
cmd->prp2 = cpu_to_le64(prp_dma);
i = 0;
for (;;) {
if (i == PAGE_SIZE / 8 - 1) {
if (i == PAGE_SIZE / 8) {
__le64 *old_prp_list = prp_list;
prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
prps->list[prp_page++] = prp_list;
old_prp_list[i] = cpu_to_le64(prp_dma);
i = 0;
prp_list[0] = old_prp_list[i - 1];
old_prp_list[i - 1] = cpu_to_le64(prp_dma);
i = 1;
}
prp_list[i++] = cpu_to_le64(dma_addr);
dma_len -= PAGE_SIZE;