Re: [PATCH 1/2] soundwire: bus: Prevent lockdep asserts when stream has multiple buses

On 15-06-23, 15:12, Richard Fitzgerald wrote:

Give the bus_lock and msg_lock of each bus a different unique key so that it is possible to acquire the locks of multiple buses without lockdep asserting a possible deadlock.

Using mutex_init() to initialize a mutex gives all those mutexes the same lock class. Lockdep checking treats it as an error to attempt to take a mutex while already holding a mutex of the same class. This causes a lockdep assert when sdw_acquire_bus_lock() attempts to lock multiple buses, and when do_bank_switch() takes multiple msg_lock.

Applied both, thanks