linux-kernel - [PATCH 01/17] i2c: add helper to check if a client has a driver attached

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Message-Id: <20191106212120.27983-2-wsa+renesas@sang-engineering.com>
Date:   Wed,  6 Nov 2019 22:21:01 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-media@...r.kernel.org
Cc:     linux-i2c@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 01/17] i2c: add helper to check if a client has a driver attached

Factoring out something used in the media subsystem. As an improvement,
it bails out on both, NULL and ERRPTR.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 include/linux/i2c.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index aaf57d9b41db..93b315c9a062 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -850,6 +850,11 @@ extern void i2c_del_driver(struct i2c_driver *driver);
 #define i2c_add_driver(driver) \
 	i2c_register_driver(THIS_MODULE, driver)
 
+static inline bool i2c_client_has_driver(struct i2c_client *client)
+{
+	return !IS_ERR_OR_NULL(client) && client->dev.driver;
+}
+
 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 extern void i2c_release_client(struct i2c_client *client);
 
-- 
2.20.1