diff options
| author | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2016-09-16 18:02:44 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-09-24 10:50:00 +0200 |
| commit | 2771dc34ddaa313127d6431f23ae4cea26b869b0 (patch) | |
| tree | 94baef22dc81107ef9c081e75554dbe090474f67 | |
| parent | a5ecddfe0bf82c92cc2e47385e287b21361a8d70 (diff) | |
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>
| -rw-r--r-- | drivers/i2c/i2c-core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 981de21ab814..98fffa3a09f7 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -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); |