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Guenter Roeck 4e450dfd0f tty: serial: Work around warning backtrace in serial8250_set_defaults Commit `7c7e6c8924` ("tty: serial: handle HAS_IOPORT dependencies") triggers warning backtraces on a number of platforms which don't support IO ports. WARNING: CPU: 0 PID: 0 at drivers/tty/serial/8250/8250_port.c:470 serial8250_set_defaults+0x148/0x1d8 Unsupported UART type 0 The problem is seen because serial8250_set_defaults() is called for all members of the serial8250_ports[] array even if that array is not initialized. Work around the problem by only displaying the warning if the port type is not 0 (UPIO_PORT) or if iobase is set for the port. Fixes: `7c7e6c8924` ("tty: serial: handle HAS_IOPORT dependencies") Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Stafford Horne <shorne@gmail.com> Link: https://lore.kernel.org/r/20241205143033.2695333-1-linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2024-12-06 08:00:01 +01:00
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README

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.