linux-kernel - [PATCH AUTOSEL 4.14 3/7] i2c: mux: Avoid potential false error message in i2c_mux_add

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Message-Id: <20231008005053.3768625-3-sashal@kernel.org>
Date:   Sat,  7 Oct 2023 20:50:49 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-i2c@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 3/7] i2c: mux: Avoid potential false error message in i2c_mux_add_adapter

From: Heiner Kallweit <hkallweit1@...il.com>

[ Upstream commit b13e59e74ff71a1004e0508107e91e9a84fd7388 ]

I2C_CLASS_DEPRECATED is a flag and not an actual class.
There's nothing speaking against both, parent and child, having
I2C_CLASS_DEPRECATED set. Therefore exclude it from the check.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Acked-by: Peter Rosin <peda@...ntia.se>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/i2c-mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 7ba31f6bf1488..ad5fd357b2bce 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -334,7 +334,7 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
 		priv->adap.lock_ops = &i2c_parent_lock_ops;
 
 	/* Sanity check on class */
-	if (i2c_mux_parent_classes(parent) & class)
+	if (i2c_mux_parent_classes(parent) & class & ~I2C_CLASS_DEPRECATED)
 		dev_err(&parent->dev,
 			"Segment %d behind mux can't share classes with ancestors\n",
 			chan_id);
-- 
2.40.1