From: Murali Iyer PRP list calculation is supposed to be based on device's page size. Systems with page size larger than device's page size cause corruption to the name space as well as system memory with out this fix. Systems like x86 might not experience this issue because it uses PAGE_SIZE of 4K where as powerpc uses PAGE_SIZE of 64k while NVMe device's page size varies depending upon the vendor. Signed-off-by: Murali Iyer Signed-off-by: Brian King --- drivers/block/nvme-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -puN drivers/block/nvme-core.c~nvme_power drivers/block/nvme-core.c --- linux-nvme/drivers/block/nvme-core.c~nvme_power 2015-03-24 17:12:09.912743224 -0500 +++ linux-nvme-bjking1/drivers/block/nvme-core.c 2015-03-25 09:25:43.580260410 -0500 @@ -503,12 +503,12 @@ int nvme_setup_prps(struct nvme_dev *dev struct scatterlist *sg = iod->sg; int dma_len = sg_dma_len(sg); u64 dma_addr = sg_dma_address(sg); - int offset = offset_in_page(dma_addr); + u32 page_size = dev->page_size; + int offset = dma_addr & (page_size - 1); __le64 *prp_list; __le64 **list = iod_list(iod); dma_addr_t prp_dma; int nprps, i; - u32 page_size = dev->page_size; length -= (page_size - offset); if (length <= 0) _