2015-10-14 17:28 GMT+02:00 Daniel Thompson <daniel.thompson@xxxxxxxxxx>: > On 14/10/15 16:26, M'boumba Cedric Madianga wrote: >> >> 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. > > > Check dmaengine.c for yourself but I think in this case the dmaengine > framework will hold references to the module and prevent the remove from > taking place. Yes I did it. As far I understand, the dmaengine framework will print a warning message but doesn't stop removing operation if there are some active clients. Cedric. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
