i2c: do not use internal data from driver core

The variable p is a data structure which is used by the driver core
internally and it is not expected that busses will be directly accessing
these driver core internal only data.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[wsa: removed the unlikely()]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 2949ab3c2293..f4726cdbb06a 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -73,6 +73,7 @@ static struct device_type i2c_client_type;
 static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);
 
 static struct static_key i2c_trace_msg = STATIC_KEY_INIT_FALSE;
+static bool is_registered;
 
 void i2c_transfer_trace_reg(void)
 {
@@ -1529,7 +1530,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
         int res = 0;
 
         /* Can't register until after driver model init */
-        if (unlikely(WARN_ON(!i2c_bus_type.p))) {
+        if (WARN_ON(!is_registered)) {
                 res = -EAGAIN;
                 goto out_list;
         }
@@ -1926,7 +1927,7 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
         int res;
 
         /* Can't register until after driver model init */
-        if (unlikely(WARN_ON(!i2c_bus_type.p)))
+        if (WARN_ON(!is_registered))
                 return -EAGAIN;
 
         /* add the driver to the list of i2c drivers in the driver core */
@@ -2118,6 +2119,7 @@ static int __init i2c_init(void)
         if (IS_ENABLED(CONFIG_OF_DYNAMIC))
                 WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier));
 
+        is_registered = true;
         return 0;
 
 class_err: