From: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx> When we have an ATR, and another ATR as a subdevice of the first ATR, we get lockdep warnings for the i2c_atr.lock and i2c_atr_chan.orig_addrs_lock. This is because lockdep uses a static key for the locks, and doesn't see the locks of the separate ATR instances as separate. Fix this by generating a dynamic lock key per lock instance. Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx> --- drivers/i2c/i2c-atr.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c index 5adb720af84e..5cc18606bca9 100644 --- a/drivers/i2c/i2c-atr.c +++ b/drivers/i2c/i2c-atr.c @@ -54,6 +54,7 @@ struct i2c_atr_chan { /* Lock orig_addrs during xfer */ struct mutex orig_addrs_lock; + struct lock_class_key orig_addrs_lock_key; u16 *orig_addrs; unsigned int orig_addrs_size; }; @@ -84,6 +85,7 @@ struct i2c_atr { struct i2c_algorithm algo; /* lock for the I2C bus segment (see struct i2c_lock_operations) */ struct mutex lock; + struct lock_class_key lock_key; int max_adapters; size_t num_aliases; @@ -505,7 +507,9 @@ struct i2c_atr *i2c_atr_new(struct i2c_adapter *parent, struct device *dev, if (!atr) return ERR_PTR(-ENOMEM); - mutex_init(&atr->lock); + lockdep_register_key(&atr->lock_key); + mutex_init_with_key(&atr->lock, &atr->lock_key); + spin_lock_init(&atr->alias_mask_lock); atr->parent = parent; @@ -535,6 +539,7 @@ struct i2c_atr *i2c_atr_new(struct i2c_adapter *parent, struct device *dev, kfree(atr->aliases); err_destroy_mutex: mutex_destroy(&atr->lock); + lockdep_unregister_key(&atr->lock_key); kfree(atr); return ERR_PTR(ret); @@ -552,6 +557,7 @@ void i2c_atr_delete(struct i2c_atr *atr) bitmap_free(atr->alias_use_mask); kfree(atr->aliases); mutex_destroy(&atr->lock); + lockdep_unregister_key(&atr->lock_key); kfree(atr); } EXPORT_SYMBOL_NS_GPL(i2c_atr_delete, I2C_ATR); @@ -586,7 +592,8 @@ int i2c_atr_add_adapter(struct i2c_atr *atr, u32 chan_id, chan->atr = atr; chan->chan_id = chan_id; INIT_LIST_HEAD(&chan->alias_list); - mutex_init(&chan->orig_addrs_lock); + lockdep_register_key(&chan->orig_addrs_lock_key); + mutex_init_with_key(&chan->orig_addrs_lock, &chan->orig_addrs_lock_key); snprintf(chan->adap.name, sizeof(chan->adap.name), "i2c-%d-atr-%d", i2c_adapter_id(parent), chan_id); @@ -646,6 +653,7 @@ int i2c_atr_add_adapter(struct i2c_atr *atr, u32 chan_id, err_fwnode_put: fwnode_handle_put(dev_fwnode(&chan->adap.dev)); mutex_destroy(&chan->orig_addrs_lock); + lockdep_unregister_key(&chan->orig_addrs_lock_key); kfree(chan); return ret; } @@ -679,6 +687,7 @@ void i2c_atr_del_adapter(struct i2c_atr *atr, u32 chan_id) fwnode_handle_put(fwnode); mutex_destroy(&chan->orig_addrs_lock); + lockdep_unregister_key(&chan->orig_addrs_lock_key); kfree(chan->orig_addrs); kfree(chan); } -- 2.43.0