libnvdimm, pmem: Fix memcpy_mcsafe() return code handling in nsio_rw_bytes()

Commit 60622d68227d "x86/asm/memcpy_mcsafe: Return bytes remaining"
converted callers of memcpy_mcsafe() to expect a positive 'bytes
remaining' value rather than a negative error code. The nsio_rw_bytes()
conversion failed to return success. The failure is benign in that
nsio_rw_bytes() will end up writing back what it just read.

Fixes: 60622d68227d ("x86/asm/memcpy_mcsafe: Return bytes remaining")
Cc: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/nvdimm/claim.c b/drivers/nvdimm/claim.c
index 2e96b34bc936bf89f6a9a65d983e4bbf3a673fbd..fb667bf469c7e980411c2836d4a9b97d1f96a53d 100644 (file)
--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -278,6 +278,7 @@ static int nsio_rw_bytes(struct nd_namespace_common *ndns,
                        return -EIO;
                if (memcpy_mcsafe(buf, nsio->addr + offset, size) != 0)
                        return -EIO;
+               return 0;
        }
 
        if (unlikely(is_bad_pmem(&nsio->bb, sector, sz_align))) {