linux-kernel - [PATCH v2] soc: qcom: apr: Add check for idr

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Message-Id: <20220913073110.1730357-1-jiasheng@iscas.ac.cn>
Date:   Tue, 13 Sep 2022 15:31:10 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     quic_jjohnson@...cinc.co, agross@...nel.org,
        bjorn.andersson@...aro.org, konrad.dybcio@...ainline.org
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] soc: qcom: apr: Add check for idr_alloc

As idr_alloc() can return negative numbers,
it should be better to check the return value and
deal with the exception.

Fixes: 6adba21eb434 ("soc: qcom: Add APR bus driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v1 -> v2:

1. Add dev_err and put_device in order to maintain the code consistency.
---
 drivers/soc/qcom/apr.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index b4046f393575..5fef2750623a 100644
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -454,8 +454,14 @@ 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);
+		put_device(&adev->dev);
+		kfree(adev);
+		return ret;
+	}
 
 	of_property_read_string_index(np, "qcom,protection-domain",
 				      1, &adev->service_path);
-- 
2.25.1