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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>
hifive-unleashed-5.1
Sudip Mukherjee 2016-03-07 17:19:17 +05:30 committed by Wolfram Sang
parent 30e31a1fbc
commit 95026658c4
1 changed files with 4 additions and 2 deletions
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6
drivers/i2c/i2c-core.c
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@ -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: