NVMe: Fix endian-related problems in user I/O submission path

When constructing the command, dsmgmt needs to be treated as a 32-bit
value, not a 16-bit value.  reftag, apptag and appmask all need to be
converted from native-endian to little-endian.  Again, sparse's bitwise
warnings caught this problem.  Thanks to Keith for pointing out the
correct way to fix the reftag.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Keith Busch <keith.busch@intel.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index a3c7d50..dbd2103 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1166,10 +1166,10 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
        c.rw.slba = cpu_to_le64(io.slba);
        c.rw.length = cpu_to_le16(io.nblocks);
        c.rw.control = cpu_to_le16(io.control);
-       c.rw.dsmgmt = cpu_to_le16(io.dsmgmt);
-       c.rw.reftag = io.reftag;
-       c.rw.apptag = io.apptag;
-       c.rw.appmask = io.appmask;
+       c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
+       c.rw.reftag = cpu_to_le32(io.reftag);
+       c.rw.apptag = cpu_to_le16(io.apptag);
+       c.rw.appmask = cpu_to_le16(io.appmask);
        /* XXX: metadata */
        length = nvme_setup_prps(dev, &c.common, iod, length, GFP_KERNEL);
 

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 09f419d..7ae7ecf 100644 (file)
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -207,11 +207,11 @@ struct nvme_common_command {
        __u8                    flags;
        __u16                   command_id;
        __le32                  nsid;
-       __u32                   cdw2[2];
+       __le32                  cdw2[2];
        __le64                  metadata;
        __le64                  prp1;
        __le64                  prp2;
-       __u32                   cdw10[6];
+       __le32                  cdw10[6];
 };
 
 struct nvme_rw_command {