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Commit d1a490e0 authored by Nisheeth Bhat's avatar Nisheeth Bhat Committed by Matthew Wilcox
Browse files

NVMe: Fix calls to dma_unmap_sg 



dma_unmap_sg() must be called with the same 'nents' passed to
dma_map_sg(), not the number returned from dma_map_sg().

Signed-off-by: default avatarNisheeth Bhat <nisheeth.bhat@intel.com>
Signed-off-by: default avatarMatthew Wilcox <matthew.r.wilcox@intel.com>
parent d0ba1e49

drivers/block/nvme.c

+4 −6
Original line number Diff line number Diff line
@@ -1021,13 +1021,12 @@ static int nvme_map_user_pages(struct nvme_dev *dev, int write, 
}



static void nvme_unmap_user_pages(struct nvme_dev *dev, int write,

				unsigned long addr, int length,

				struct scatterlist *sg, int nents)

			unsigned long addr, int length, struct scatterlist *sg)

{

	int i, count;



	count = DIV_ROUND_UP(offset_in_page(addr) + length, PAGE_SIZE);

	dma_unmap_sg(&dev->pci_dev->dev, sg, nents, DMA_FROM_DEVICE);

	dma_unmap_sg(&dev->pci_dev->dev, sg, count, DMA_FROM_DEVICE);



	for (i = 0; i < count; i++)

		put_page(sg_page(&sg[i]));
@@ -1089,7 +1088,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 
	else

		status = nvme_submit_sync_cmd(nvmeq, &c, NULL, IO_TIMEOUT);



	nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg, nents);

	nvme_unmap_user_pages(dev, io.opcode & 1, io.addr, length, sg);

	nvme_free_prps(dev, prps);

	return status;

}
@@ -1135,8 +1134,7 @@ static int nvme_user_admin_cmd(struct nvme_ns *ns, 
	else

		status = nvme_submit_admin_cmd(dev, &c, NULL);

	if (cmd.data_len) {

		nvme_unmap_user_pages(dev, 0, cmd.addr, cmd.data_len, sg,

									nents);

		nvme_unmap_user_pages(dev, 0, cmd.addr, cmd.data_len, sg);

		nvme_free_prps(dev, prps);

	}

	return status;