soc: qcom: apr: Add check for idr_alloc and of_property_read_string_index

As idr_alloc() and of_property_read_string_index() can return negative
numbers, it should be better to check the return value and deal with
the exception.
Therefore, it should be better to use goto statement to stop and return
error.

Fixes: 6adba21eb434 ("soc: qcom: Add APR bus driver")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221107014403.3606-1-jiasheng@iscas.ac.cn

diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index b4046f3..cd44f17 100644 (file)
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -454,11 +454,19 @@ static int apr_add_device(struct device *dev, struct device_node *np,
        adev->dev.driver = NULL;
 
        spin_lock(&apr->svcs_lock);
-       idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
+       ret = idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
        spin_unlock(&apr->svcs_lock);
+       if (ret < 0) {
+               dev_err(dev, "idr_alloc failed: %d\n", ret);
+               goto out;
+       }
 
-       of_property_read_string_index(np, "qcom,protection-domain",
-                                     1, &adev->service_path);
+       ret = of_property_read_string_index(np, "qcom,protection-domain",
+                                           1, &adev->service_path);
+       if (ret < 0) {
+               dev_err(dev, "Failed to read second value of qcom,protection-domain\n");
+               goto out;
+       }
 
        dev_info(dev, "Adding APR/GPR dev: %s\n", dev_name(&adev->dev));
 
@@ -468,6 +476,7 @@ static int apr_add_device(struct device *dev, struct device_node *np,
                put_device(&adev->dev);
        }
 
+out:
        return ret;
 }