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When a tty driver pointer is used as a return value of struct console's device() hook, don't store a semi-state into global variable which holds the tty driver. It could mean console::device() would return a bogus value. This is important esp. after the next patch where we switch from alloc_tty_driver to tty_alloc_driver. tty_alloc_driver returns ERR_PTR in case of error and that might have unexpected results as the code doesn't expect this. Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com> Cc: Felipe Balbi <balbi@kernel.org> Reviewed-by: Max Filippov <jcmvbkbc@gmail.com> Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210723074317.32690-4-jslaby@suse.cz 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.