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drm/meson: add missing of_node_put

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[ Upstream commit f672b93e4a ]

Add an of_node_put when the result of of_graph_get_remote_port_parent is
not available.

An of_node_put is also needed when meson_probe_remote completes.  This was
present at the recursive call, but not in the call from meson_drv_probe.

The semantic match that finds this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@r exists@
local idexpression e;
expression x;
@@
e = of_graph_get_remote_port_parent(...);
... when != x = e
    when != true e == NULL
    when != of_node_put(e)
    when != of_fwnode_handle(e)
(
return e;
|
*return ...;
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1547372691-28324-4-git-send-email-Julia.Lawall@lip6.fr
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Julia Lawall
2019-01-13 10:44:51 +01:00
committed by Greg Kroah-Hartman
parent c818b5b471
commit 6d09976cca
1 changed files with 7 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/gpu/drm/meson/meson_drv.c
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@@ -368,8 +368,10 @@ static int meson_probe_remote(struct platform_device *pdev,
remote_node = of_graph_get_remote_port_parent(ep);
if (!remote_node ||
remote_node == parent || /* Ignore parent endpoint */
!of_device_is_available(remote_node))
!of_device_is_available(remote_node)) {
of_node_put(remote_node);
continue;
}
count += meson_probe_remote(pdev, match, remote, remote_node);
@@ -388,10 +390,13 @@ static int meson_drv_probe(struct platform_device *pdev)
for_each_endpoint_of_node(np, ep) {
remote = of_graph_get_remote_port_parent(ep);
if (!remote || !of_device_is_available(remote))
if (!remote || !of_device_is_available(remote)) {
of_node_put(remote);
continue;
}
count += meson_probe_remote(pdev, &match, np, remote);
of_node_put(remote);
}
if (count && !match)