linux-kernel - [PATCH] mailbox: handle failed named mailbox channel request

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Date:   Mon, 8 Jul 2019 11:41:54 +0000
From:   morten petersen <morten_bp@...e.dk>
To:     "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     morten petersen <morten_bp@...e.dk>
Subject: [PATCH] mailbox: handle failed named mailbox channel request

Previously, if mbox_request_channel_byname was used with a name
which did not exist in the "mbox-names" property of a mailbox
client, the mailbox corresponding to the last entry in the
"mbox-names" list would be incorrectly selected.
With this patch, -EINVAL is returned if the named mailbox is
not found.

Signed-off-by: Morten Borup Petersen <morten_bp@...e.dk>
---
 drivers/mailbox/mailbox.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index f4b1950..c823fd6 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -418,11 +418,13 @@ struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
 
 	of_property_for_each_string(np, "mbox-names", prop, mbox_name) {
 		if (!strncmp(name, mbox_name, strlen(name)))
-			break;
+			return mbox_request_channel(cl, index);
 		index++;
 	}
 
-	return mbox_request_channel(cl, index);
+	dev_err(cl->dev, "%s() could not locate mailbox named \"%s\"\n",
+		__func__, name);
+	return ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(mbox_request_channel_byname);
 
-- 
2.7.4