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Commit 2771dc34 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Wolfram Sang
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i2c: add a warning to i2c_adapter_depth() 



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: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: default avatarPeter Rosin <peda@axentia.se>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent a5ecddfe

drivers/i2c/i2c-core.c

+3 −0
Original line number Diff line number Diff line
@@ -1433,6 +1433,9 @@ 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);