[PATCH AUTOSEL 5.1 117/141] mailbox: handle failed named mailbox channel request

[Sasha Levin]

From: morten petersen <morten...@live.dk>

[ Upstream commit 25777e5784a7b417967460d4fcf9660d05a0c320 ]

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...@live.dk>
Signed-off-by: Jassi Brar <jaswinder.si...@linaro.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 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 38d9df3fb199..ad79f128fbc7 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -421,11 +421,13 @@ 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 channel named \"%s\"\n",
+               __func__, name);
+       return ERR_PTR(-EINVAL);
 }
 EXPORT_SYMBOL_GPL(mbox_request_channel_byname);
 
-- 
2.20.1