[PATCH 5.10 95/98] soc: qcom: apr: Make qcom,protection-domain optional again

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Stephan Gerhold <stephan@xxxxxxxxxxx>

commit 599d41fb8ea8bd2a99ca9525dd69405020e43dda upstream.

APR should not fail if the service device tree node does not have
the qcom,protection-domain property, since this functionality does
not exist on older platforms such as MSM8916 and MSM8996.

Ignore -EINVAL (returned when the property does not exist) to fix
a regression on 6.2-rc1 that prevents audio from working:

  qcom,apr remoteproc0:smd-edge.apr_audio_svc.-1.-1:
    Failed to read second value of qcom,protection-domain
  qcom,apr remoteproc0:smd-edge.apr_audio_svc.-1.-1:
    Failed to add apr 3 svc

Fixes: 6d7860f5750d ("soc: qcom: apr: Add check for idr_alloc and of_property_read_string_index")
Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221229151648.19839-3-stephan@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/soc/qcom/apr.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -319,9 +319,10 @@ static int apr_add_device(struct device
 		goto out;
 	}
 
+	/* Protection domain is optional, it does not exist on older platforms */
 	ret = of_property_read_string_index(np, "qcom,protection-domain",
 					    1, &adev->service_path);
-	if (ret < 0) {
+	if (ret < 0 && ret != -EINVAL) {
 		dev_err(dev, "Failed to read second value of qcom,protection-domain\n");
 		goto out;
 	}