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drm/msm: fix OF child-node lookup

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commit f9a7082327e26f54067a49cac2316d31e0cc8ba7 upstream.

Use the new of_get_compatible_child() helper to lookup the legacy
pwrlevels 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 probed device's node).

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

Fixes: e2af8b6b0ca1 ("drm/msm: gpu: Use OPP tables if we can")
Cc: stable <stable@vger.kernel.org>     # 4.12
Cc: Jordan Crouse <jcrouse@codeaurora.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
[ johan: backport to 4.14 ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2018-08-27 10:21:47 +02:00 committed by Greg Kroah-Hartman
parent b002e9dc21
commit 84ee7f8923
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/msm/adreno/adreno_device.c
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@ -223,8 +223,7 @@ static int adreno_get_legacy_pwrlevels(struct device *dev)
struct device_node *child, *node;
int ret;
node = of_find_compatible_node(dev->of_node, NULL,
"qcom,gpu-pwrlevels");
node = of_get_compatible_child(dev->of_node, "qcom,gpu-pwrlevels");
if (!node) {
dev_err(dev, "Could not find the GPU powerlevels\n");
return -ENXIO;
@ -245,6 +244,8 @@ static int adreno_get_legacy_pwrlevels(struct device *dev)
dev_pm_opp_add(dev, val, 0);
}
of_node_put(node);
return 0;
}