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[ Upstream commitfac4b8633f] During ucsi_unregister() when destroying a connector's workqueue, there may still be pending delayed work items that haven't been scheduled yet. Because queue_delayed_work() uses a separate timer to schedule a work item, the destroy_workqueue() call is not aware of any pending items. Hence when a pending item's timer expires it would then try to queue on a dangling workqueue pointer. Fix this by keeping track of all work items in a list, so that prior to destroying the workqueue any pending items can be flushed. Do this by calling mod_delayed_work() as that will cause pending items to get queued immediately, which then allows the ensuing destroy_workqueue() to implicitly drain all currently queued items to completion and free themselves. Fixes:b9aa02ca39("usb: typec: ucsi: Add polling mechanism for partner tasks like alt mode checking") Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Co-developed-by: Linyu Yuan <quic_linyyuan@quicinc.com> Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com> Signed-off-by: Jack Pham <quic_jackp@quicinc.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20230110071218.26261-1-quic_jackp@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.