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: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Peter Rosin <peda@axentia.se> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -1433,6 +1433,9 @@ unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
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while ((adapter = i2c_parent_is_i2c_adapter(adapter)))
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depth++;
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WARN_ONCE(depth >= MAX_LOCKDEP_SUBCLASSES,
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"adapter depth exceeds lockdep subclass limit\n");
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return depth;
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}
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EXPORT_SYMBOL_GPL(i2c_adapter_depth);
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