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spi: document odd controller reference handling
Document the fact that a reference to the controller is dropped as part of deregistration. This is an odd pattern as the reference is typically taken in __spi_alloc_controller() rather than spi_register_controller(). Most controller drivers gets it right these days and notably the device-managed interface relies on this behaviour. Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -2195,7 +2195,7 @@ static void devm_spi_unregister(struct device *dev, void *res)
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* Context: can sleep
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*
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* Register a SPI device as with spi_register_controller() which will
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* automatically be unregister
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* automatically be unregistered and freed.
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*
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* Return: zero on success, else a negative error code.
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*/
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@ -2236,6 +2236,8 @@ static int __unregister(struct device *dev, void *null)
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* only ones directly touching chip registers.
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*
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* This must be called from context that can sleep.
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*
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* Note that this function also drops a reference to the controller.
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*/
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void spi_unregister_controller(struct spi_controller *ctlr)
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{
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