From f137e0f15101c0a0ff8a5d956042e50247f1fef9 Mon Sep 17 00:00:00 2001 From: Murali Iyer Date: Thu, 26 Mar 2015 11:07:51 -0500 Subject: [PATCH] nvme: Fix PRP list calculation for non-4k system page size 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 Acked-by: Keith Busch Signed-off-by: Jens Axboe --- drivers/block/nvme-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index c12c95cf2e55..4dc858b43c92 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -640,12 +640,12 @@ int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, int total_len, 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) -- 2.34.1