2015-10-14 16:24 GMT+02:00 Daniel Thompson <daniel.thompson@xxxxxxxxxx>: > > Hmnnn... > > The dmaengine framework will WARN_ONCE() if an dmaengine is removed whilst > it is active and also works hard to ensure dmaengine modules are not removed > whilst there are active drivers using the framework. > > How do we get into this function whilst there is still an active DMA > channels? For example, when a user try "rmmod stm32-dma" in uart console. It will enter in stm32_dma_remove while there is potentially still active DMA. > > >> But even with this improvement, I think I have to disable the clock here. > > > As above, I think the dmaengine framework work to protect you from this sort > problem. However even if I am wrong about that then unconditionally calling > clk_disable_unprepare() can not be used to reliably manage the clocks. You > don't know what the counts are! Ok got it. Thanks for the clarification. Cedric -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
