On Mon, 2007-12-17 at 16:43 +0100, Jaroslav Kysela wrote: > On Mon, 17 Dec 2007, Hans-Christian Egtvedt wrote: > > I am solving a locking bug in the at73c213 SPI sound driver, and > > wondered if the mixer API is protected against concurrent access in > > ALSA? Or should I implement a mutex to protect my hardware against > > concurrent access? > > Control r/w callbacks are protected with a semaphore - > card->controls_rwsem . See sound/core/control.c for more details. Anyway, > you need to protect your registers with spinlocks (if required of > course). > Thanks for the feedback. I settled upon a mutex since the SPI driver can not use spinlocks due to a might sleepy spi_sync function call. -- Mvh Hans-Christian Egtvedt _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
