i2c: Mark adapter devices with pm_runtime_no_callbacks

Commit 523c5b89640e ("i2c: Remove support for legacy PM") removed the PM
ops from the bus type, which causes the pm operations on the s3c2410
adapter device to fail (-ENOSUPP in rpm_callback). The adapter device
doesn't get bound to a driver and as such can't have its own pm_runtime
callbacks. Previously this was fine as the bus callbacks would have been
used, but now this can cause devices which use PM runtime and are
attached over I2C to fail to resume.

This commit fixes this issue by marking all adapter devices with
pm_runtime_no_callbacks, since they can't have any.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Beata Michalska <b.michalska@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Fixes: 523c5b89640e
Cc: stable@kernel.org

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 098f698fe8f4708afc6b2d5785a7b4be8635a428..987c124432c501f7a5cabb83bdc638c0f337fcb7 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1413,6 +1413,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 
        dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
+       pm_runtime_no_callbacks(&adap->dev);
+
 #ifdef CONFIG_I2C_COMPAT
        res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
                                       adap->dev.parent);