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powerpc/legacy_serial: Handle SERIAL_8250_FSL=n build failures 

With SERIAL_8250=y and SERIAL_8250_FSL_CONSOLE=n the both
IS_ENABLED(CONFIG_SERIAL_8250) and IS_REACHABLE(CONFIG_SERIAL_8250)
evaluate to true and so fsl8250_handle_irq() is used. However this
function is only available if CONFIG_SERIAL_8250_CONSOLE=y (and thus
SERIAL_8250_FSL=y).

To prepare SERIAL_8250_FSL becoming tristate and being enabled in more
cases, check for IS_REACHABLE(CONFIG_SERIAL_8250_FSL) before making use
of fsl8250_handle_irq(). This check is correct with and without the
change to make SERIAL_8250_FSL modular.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Fixes: 66eff0ef52 ("powerpc/legacy_serial: Warn about 8250 devices operated without active FSL workarounds")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Message-ID: <20230609133932.786117-2-u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2023-06-09 15:39:31 +02:00 committed by Greg Kroah-Hartman
parent 52861a3be8
commit 1eea99c045
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/legacy_serial.c
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@ -510,7 +510,7 @@ static void __init fixup_port_irq(int index,
if (IS_ENABLED(CONFIG_SERIAL_8250) &&
of_device_is_compatible(np, "fsl,ns16550")) {
if (IS_REACHABLE(CONFIG_SERIAL_8250)) {
if (IS_REACHABLE(CONFIG_SERIAL_8250_FSL)) {
port->handle_irq = fsl8250_handle_irq;
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
} else {