diff options
| author | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2011-03-16 16:43:40 -0400 |
|---|---|---|
| committer | Matthew Wilcox <matthew.r.wilcox@intel.com> | 2011-11-04 15:53:00 -0400 |
| commit | 7523d834dd1573610078eb1ac0933f6490232f90 (patch) | |
| tree | 898be553899785ac400e98f23f99881e51a2c8f8 | |
| parent | ac88c36a385b848cb9efcb877fdfc4153a60bcab (diff) | |
NVMe: Fix off-by-one when filling in PRP lists
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>
| -rw-r--r-- | drivers/block/nvme.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c index 0d5c918b7d5..cf89db8c41e 100644 --- a/drivers/block/nvme.c +++ b/drivers/block/nvme.c @@ -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; |