If an earlycon console driver needs to acquire the uart_port.lock
spinlock for serial console output, and CONFIG_DEBUG_SPINLOCK=y:

    BUG: spinlock bad magic on CPU#0, swapper/0
     lock: sci_ports+0x0/0x3480, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
    CPU: 0 PID: 0 Comm: swapper Not tainted 4.4.0-rc2-koelsch-g62ea5edf143bb1d0-dirty #2083
    Hardware name: Generic R8A7791 (Flattened Device Tree)
    [<c00173a0>] (unwind_backtrace) from [<c0013094>] (show_stack+0x10/0x14)
    [<c0013094>] (show_stack) from [<c01f2338>] (dump_stack+0x70/0x8c)
    [<c01f2338>] (dump_stack) from [<c00702d8>] (do_raw_spin_lock+0x20/0x190)
    [<c00702d8>] (do_raw_spin_lock) from [<c0267590>] (serial_console_write+0x4c/0x130)
    [<c0267590>] (serial_console_write) from [<c00734c4>] (call_console_drivers.constprop.13+0xc8/0xec)
    [<c00734c4>] (call_console_drivers.constprop.13) from [<c0074ef0>] (console_unlock+0x354/0x440)
    [<c0074ef0>] (console_unlock) from [<c0075bb4>] (register_console+0x2a0/0x394)
    [<c0075bb4>] (register_console) from [<c06cb750>] (of_setup_earlycon+0x90/0xa4)
    [<c06cb750>] (of_setup_earlycon) from [<c06cfb60>] (setup_of_earlycon+0x118/0x13c)
    [<c06cfb60>] (setup_of_earlycon) from [<c06b34ac>] (do_early_param+0x64/0xb4)
    [<c06b34ac>] (do_early_param) from [<c00472c0>] (parse_args+0x254/0x350)
    [<c00472c0>] (parse_args) from [<c06b3860>] (parse_early_options+0x2c/0x3c)
    [<c06b3860>] (parse_early_options) from [<c06b389c>] (parse_early_param+0x2c/0x40)
    [<c06b389c>] (parse_early_param) from [<c06b5b08>] (setup_arch+0x520/0xaf0)
    [<c06b5b08>] (setup_arch) from [<c06b3948>] (start_kernel+0x94/0x370)
    [<c06b3948>] (start_kernel) from [<40008090>] (0x40008090)

Initialize the spinlock in of_setup_earlycon() and register_earlycon(),
to fix this for both DT-based and legacy earlycon.  If the driver would
reinitialize the spinlock again, this is harmless, as it's allowed to
reinitialize an unlocked spinlock.

Alternatives are:
  - Drivers having an early_serial_console_write() that only performs
    the core functionality of serial_console_write(), without acquiring
    the lock (which may be unsafe, depending on the hardware),
  - Drivers initializing the spinlock in their private earlycon setup
    functions.

As uart_port is owned by generic serial_core, and uart_port.lock is
initialized by uart_add_one_port() for the normal case, this can better
be handled in the earlycon core.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reported-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>