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e21de1455a
If a serdev_device_driver is already loaded for a serdev_tty_port when it gets registered by tty_port_register_device_attr_serdev() then that driver's probe() method will be called immediately. The serdev_device_driver's probe() method should then be able to call serdev_device_open() successfully, but because UPF_DEAD is still dead serdev_device_open() will fail with -ENXIO in this scenario: serdev_device_open() ctrl->ops->open() /* this callback being ttyport_open() */ tty->ops->open() /* this callback being uart_open() */ tty_port_open() port->ops->activate() /* this callback being uart_port_activate() */ Find bit UPF_DEAD is set in uport->flags and fail with errno -ENXIO. Fix this be clearing UPF_DEAD before tty_port_register_device_attr_serdev() note this only moves up the UPD_DEAD clearing a small bit, before: tty_port_register_device_attr_serdev(); mutex_unlock(&tty_port.mutex); uart_port.flags &= ~UPF_DEAD; mutex_unlock(&port_mutex); after: uart_port.flags &= ~UPF_DEAD; tty_port_register_device_attr_serdev(); mutex_unlock(&tty_port.mutex); mutex_unlock(&port_mutex); Reported-by: Weifeng Liu <weifeng.liu.z@gmail.com> Closes: https://lore.kernel.org/platform-driver-x86/20240505130800.2546640-1-weifeng.liu.z@gmail.com/ Tested-by: Weifeng Liu <weifeng.liu.z@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20240509141549.63704-1-hdegoede@redhat.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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 reStructuredText 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.