This routine is only used together with lockdep for nested locking. The number of lock subclasses is limited to 8 as defined in lockdep.h Emit a warning if the adapter depth exceeds the maximum number of lockdep subclasses. Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> --- drivers/i2c/i2c-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index c9b8df8..75cefa8 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1342,6 +1342,9 @@ unsigned int i2c_adapter_depth(struct i2c_adapter *adapter) while ((adapter = i2c_parent_is_i2c_adapter(adapter))) depth++; + WARN_ONCE(depth >= MAX_LOCKDEP_SUBCLASSES, + "adapter depth exceeds lockdep subclass limit\n"); + return depth; } EXPORT_SYMBOL_GPL(i2c_adapter_depth); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
