4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 5bf59773aaf36dd62117dc83d50e1bbf9ef432da ]

Use the new of_get_compatible_child() helper to lookup the nfc child
node instead of using of_find_compatible_node(), which searches the
entire tree from a given start node and thus can return an unrelated
(i.e. non-child) node.

This also addresses a potential use-after-free (e.g. after probe
deferral) as the tree-wide helper drops a reference to its first
argument (i.e. the parent node).

Fixes: e097dc624f78 ("NFC: nfcmrvl: add UART driver")
Fixes: d8e018c0b321 ("NFC: nfcmrvl: update device tree bindings for Marvell 
NFC")
Cc: stable <sta...@vger.kernel.org>     # 4.2
Cc: Vincent Cuissard <cuiss...@marvell.com>
Cc: Samuel Ortiz <sa...@linux.intel.com>
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Rob Herring <r...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nfc/nfcmrvl/uart.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/nfc/nfcmrvl/uart.c b/drivers/nfc/nfcmrvl/uart.c
index 6c0c301611c4..1b11ded79c4f 100644
--- a/drivers/nfc/nfcmrvl/uart.c
+++ b/drivers/nfc/nfcmrvl/uart.c
@@ -73,10 +73,9 @@ static int nfcmrvl_uart_parse_dt(struct device_node *node,
        struct device_node *matched_node;
        int ret;
 
-       matched_node = of_find_compatible_node(node, NULL, "marvell,nfc-uart");
+       matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
        if (!matched_node) {
-               matched_node = of_find_compatible_node(node, NULL,
-                                                      "mrvl,nfc-uart");
+               matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
                if (!matched_node)
                        return -ENODEV;
        }
-- 
2.17.1



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