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macintosh: therm_windtunnel: fix regression when instantiating devices

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Removing attach_adapter from this driver caused a regression for at
least some machines. Those machines had the sensors described in their
DT, too, so they didn't need manual creation of the sensor devices. The
old code worked, though, because manual creation came first. Creation of
DT devices then failed later and caused error logs, but the sensors
worked nonetheless because of the manually created devices.

When removing attach_adaper, manual creation now comes later and loses
the race. The sensor devices were already registered via DT, yet with
another binding, so the driver could not be bound to it.

This fix refactors the code to remove the race and only manually creates
devices if there are no DT nodes present. Also, the DT binding is updated
to match both, the DT and manually created devices. Because we don't
know which device creation will be used at runtime, the code to start
the kthread is moved to do_probe() which will be called by both methods.

Fixes: 3e7bed5271 ("macintosh: therm_windtunnel: drop using attach_adapter")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201723
Reported-by: Erhard Furtner <erhard_f@mailbox.org>
Tested-by: Erhard Furtner <erhard_f@mailbox.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org # v4.19+
This commit is contained in:
Wolfram Sang 2020-02-25 15:12:29 +01:00
parent 54498e8070
commit 38b17afb0e
1 changed files with 33 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/macintosh/therm_windtunnel.c
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@ -300,9 +300,11 @@ static int control_loop(void *dummy)
/* i2c probing and setup */
/************************************************************************/
static int
do_attach( struct i2c_adapter *adapter )
static void do_attach(struct i2c_adapter *adapter)
{
struct i2c_board_info info = { };
struct device_node *np;
/* scan 0x48-0x4f (DS1775) and 0x2c-2x2f (ADM1030) */
static const unsigned short scan_ds1775[] = {
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
@ -313,25 +315,24 @@ do_attach( struct i2c_adapter *adapter )
I2C_CLIENT_END
};
if( strncmp(adapter->name, "uni-n", 5) )
return 0;
if (x.running || strncmp(adapter->name, "uni-n", 5))
return;
if( !x.running ) {
struct i2c_board_info info;
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE);
np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,ds1775");
if (np) {
of_node_put(np);
} else {
strlcpy(info.type, "MAC,ds1775", I2C_NAME_SIZE);
i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
if( x.thermostat && x.fan ) {
x.running = 1;
x.poll_task = kthread_run(control_loop, NULL, "g4fand");
}
}
return 0;
np = of_find_compatible_node(adapter->dev.of_node, NULL, "MAC,adm1030");
if (np) {
of_node_put(np);
} else {
strlcpy(info.type, "MAC,adm1030", I2C_NAME_SIZE);
i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
}
}
static int
@ -404,8 +405,8 @@ out:
enum chip { ds1775, adm1030 };
static const struct i2c_device_id therm_windtunnel_id[] = {
{ "therm_ds1775", ds1775 },
{ "therm_adm1030", adm1030 },
{ "MAC,ds1775", ds1775 },
{ "MAC,adm1030", adm1030 },
{ }
};
MODULE_DEVICE_TABLE(i2c, therm_windtunnel_id);
@ -414,6 +415,7 @@ static int
do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = cl->adapter;
int ret = 0;
if( !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA
| I2C_FUNC_SMBUS_WRITE_BYTE) )
@ -421,11 +423,19 @@ do_probe(struct i2c_client *cl, const struct i2c_device_id *id)
switch (id->driver_data) {
case adm1030:
return attach_fan( cl );
ret = attach_fan(cl);
break;
case ds1775:
return attach_thermostat(cl);
ret = attach_thermostat(cl);
break;
}
return 0;
if (!x.running && x.thermostat && x.fan) {
x.running = 1;
x.poll_task = kthread_run(control_loop, NULL, "g4fand");
}
return ret;
}
static struct i2c_driver g4fan_driver = {