Hi Thanks for the patches. We got the DMA working for now but the tasklet_disable() and tasklet_enable() had to be removed from atc_control().
If the device driver calls dmaengine_terminate_all() from the callback (like in our previous deadlock example), the tasklet_disable() will cause another deadlock because the tasklet will then wait for itself to close. The tasklet_disable() seems to be used to ensure that no tasklet is running when terminating the DMA transfers. This prevents the terminate_all from happening in between the critical sections in the tasklet which are locked with atchan->lock. Maybe the tasklet needs to be implemented so that it can detect and recover if the terminate_all was called in between the critical sections in the tasklet? BR, Jouko Haapaluoma -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
