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serial: 8250: of: Defer probe on missing IRQ

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If the IRQ controller is not yet probed do not proceed with irq=0,
try to defer the probe.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Sverdlin 2018-07-13 17:01:19 +02:00 committed by Greg Kroah-Hartman
parent b29330d829
commit c58caaab3b
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/8250/8250_of.c
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@ -144,6 +144,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
port->line = ret;
port->irq = irq_of_parse_and_map(np, 0);
if (!port->irq) {
ret = -EPROBE_DEFER;
goto err_unprepare;
}
info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
if (IS_ERR(info->rst)) {