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Randy Witt authored
The uart_set_options() code unconditionally initalizes the spinlock on the port. This can cause a deadlock in some situations. One instance that exposed the problem, was when writing to /sys/module/kgdboc/parameters/kgdboc to use ttyS0 when the console is already running on ttyS0. If the spinlock is re-initialized while the lock is held due to output to the console, there is a deadlock. Assume the spinlock is initialized if the port is a console. Signed-off-by:
Randy Witt <rewitt@declaratino.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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