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i2c: add a warning to i2c_adapter_depth()

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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>
This commit is contained in:
Bartosz Golaszewski 2016-09-16 18:02:44 +02:00 committed by Wolfram Sang
parent a5ecddfe0b
commit 2771dc34dd
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/i2c-core.c
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@ -1433,6 +1433,9 @@ unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
while ((adapter = i2c_parent_is_i2c_adapter(adapter))) while ((adapter = i2c_parent_is_i2c_adapter(adapter)))
depth++; depth++;
WARN_ONCE(depth >= MAX_LOCKDEP_SUBCLASSES,
"adapter depth exceeds lockdep subclass limit\n");
return depth; return depth;
} }
EXPORT_SYMBOL_GPL(i2c_adapter_depth); EXPORT_SYMBOL_GPL(i2c_adapter_depth);