linux-kernel - [PATCH 1/6] mailbox: use error ret code of of_parse_phandle_with

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Message-Id: <20250128-mbox-mutex-v1-1-1f0169ca5f61@linaro.org>
Date: Tue, 28 Jan 2025 09:15:46 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Jassi Brar <jassisinghbrar@...il.com>
Cc: linux-kernel@...r.kernel.org, andre.draszik@...aro.org, 
 peter.griffin@...aro.org, willmcvicker@...gle.com, kernel-team@...roid.com, 
 Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH 1/6] mailbox: use error ret code of
 of_parse_phandle_with_args()

In case of error, of_parse_phandle_with_args() returns -EINVAL when the
passed index is negative, or -ENOENT when the index is for an empty
phandle. The mailbox core overwrote the error return code with a less
precise -ENODEV. Use the error returned code from
of_parse_phandle_with_args().

Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
 drivers/mailbox/mailbox.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index d3d26a2c9895..cb174e788a96 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -415,11 +415,12 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
 
 	mutex_lock(&con_mutex);
 
-	if (of_parse_phandle_with_args(dev->of_node, "mboxes",
-				       "#mbox-cells", index, &spec)) {
+	ret = of_parse_phandle_with_args(dev->of_node, "mboxes", "#mbox-cells",
+					 index, &spec);
+	if (ret) {
 		dev_dbg(dev, "%s: can't parse \"mboxes\" property\n", __func__);
 		mutex_unlock(&con_mutex);
-		return ERR_PTR(-ENODEV);
+		return ERR_PTR(ret);
 	}
 
 	chan = ERR_PTR(-EPROBE_DEFER);

-- 
2.48.1.262.g85cc9f2d1e-goog