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[PATCH for v4.9 LTS 67/86] pmem: return EIO on read_pmem() failure

From: Stefan Hajnoczi <stefanha@xxxxxxxxxx>

[ Upstream commit d47d1d27fd6206c18806440f6ebddf51a806be4f ]

The read_pmem() function uses memcpy_mcsafe() on x86 where an EFAULT
error code indicates a failed read.  Block I/O should use EIO to
indicate failure.  Other pmem code paths (like bad blocks) already use
EIO so let's be consistent.

This fixes compatibility with consumers like btrfs that try to parse the
specific error code rather than treat all errors the same.

Reviewed-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
 drivers/nvdimm/pmem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index b4808590870c..3456f532077c 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -87,7 +87,9 @@ static int read_pmem(struct page *page, unsigned int off,
 	rc = memcpy_from_pmem(mem + off, pmem_addr, len);
-	return rc;
+	if (rc)
+		return -EIO;
+	return 0;
 static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,