mmc: meson-mx-sdio: fix OF child-node lookup

Use the new of_get_compatible_child() helper to lookup the slot 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 node of the device being probed).

While at it, also fix up the related slot-node reference leak.

Fixes: ed80a13bb4c4 ("mmc: meson-mx-sdio: Add a driver for the Amlogic Meson8 and Meson8b SoCs")
Cc: stable <[email protected]>     # 4.15
Cc: Carlo Caione <[email protected]>
Cc: Martin Blumenstingl <[email protected]>
Cc: Ulf Hansson <[email protected]>
Acked-by: Martin Blumenstingl <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>

0 files changed, 0 insertions, 0 deletions