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[ Upstream commit 7bf1158514e410310aec975e630cec99d4e4092f ] While the userspace program can be notified of gadget state changes, timing issue can lead to missed transitions when reading the state value. Introduce a trace event for usb_gadget_set_state to reliably track state transitions. Signed-off-by: Kuen-Han Tsai <khtsai@google.com> Link: https://lore.kernel.org/r/20250818082722.2952867-1-khtsai@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Stable-dep-of: baeb66fbd420 ("usb: gadget: udc: fix use-after-free in usb_gadget_state_work") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.