On Wed, Oct 13, 2021 at 03:37:09PM +0200, Uwe Kleine-König wrote: > The spi_add_lock that is removed with this change was held when > spi_add_device() called device_add() (via __spi_add_device()). > > In the case where the added device is an spi-mux calling device_add() > might result in calling the spi-mux's probe function which adds another > controller and for that spi_add_device() might be called. This results > in a dead-lock. > > To circumvent this deadlock replace the global spi_add_lock with a lock > per controller. > > The biggest part of this patch was authored by Mark Brown. I'll go ahead with my copy of this (partly as I've already got it ready queued).
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