[PATCH 5.4 019/348] [xarray] iov_iter_fault_in_readable() should do nothing in xarray case

[Greg Kroah-Hartman]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

commit 0e8f0d67401589a141950856902c7d0ec8d9c985 upstream.

... and actually should just check it's given an iovec-backed iterator
in the first place.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 lib/iov_iter.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -422,7 +422,7 @@ int iov_iter_fault_in_readable(struct io
 	int err;
 	struct iovec v;
 
-	if (!(i->type & (ITER_BVEC|ITER_KVEC))) {
+	if (iter_is_iovec(i)) {
 		iterate_iovec(i, bytes, v, iov, skip, ({
 			err = fault_in_pages_readable(v.iov_base, v.iov_len);
 			if (unlikely(err))