:orphan:

.. title:: USB_WORKQUEUE

.. option:: CONFIG_USB_WORKQUEUE

*Use a dedicate work queue in the USB subsystem*

Type: ``bool``

Help
====

This option provides a dedicated work queue that is used for
all offloaded operations initiated by the USB subsystem.
This prevents deadlock situations where tasks on the system
workqueue inadvertently initiate operations that block, such
as UART transmission on CDC-ACM, preventing the system work
queue from making progress on the USB tasks that would
release the task.

Without this the system work queue is used for all USB
offloaded transfers.

Direct dependencies
===================

\ :option:`USB_DEVICE_STACK <CONFIG_USB_DEVICE_STACK>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- y if \ :option:`USB_CDC_ACM <CONFIG_USB_CDC_ACM>`

Kconfig definition
==================

.. highlight:: kconfig

At ``subsys/usb/Kconfig:112``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:45``

Menu path: (Top) → Sub Systems and OS Services → USB Device Support

.. parsed-literal::

    config USB_WORKQUEUE
    	bool "Use a dedicate work queue in the USB subsystem"
    	default y if \ :option:`USB_CDC_ACM <CONFIG_USB_CDC_ACM>`
    	depends on \ :option:`USB_DEVICE_STACK <CONFIG_USB_DEVICE_STACK>`
    	help
    	  This option provides a dedicated work queue that is used for
    	  all offloaded operations initiated by the USB subsystem.
    	  This prevents deadlock situations where tasks on the system
    	  workqueue inadvertently initiate operations that block, such
    	  as UART transmission on CDC-ACM, preventing the system work
    	  queue from making progress on the USB tasks that would
    	  release the task.
	  
    	  Without this the system work queue is used for all USB
    	  offloaded transfers.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*