[PATCH v2 1/1] serial: sh-sci: Respect deferred probe when getting IRQ

Andy Shevchenko
2021-04-07T10:17:11Z

With platform_get_irq() and its optional variant it's possible to get
a deferred probe error code. Since the commit ed7027fdf4ec ("driver core:
platform: Make platform_get_irq_optional() optional") the error code
can be distinguished from no IRQ case. With this, rewrite IRQ resource
handling in sh-sci driver to follow above and allow to respect deferred
probe.

Fixes: ed7027fdf4ec ("driver core: platform: Make platform_get_irq_optional() optional")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: fixed a typo: i -> 0
drivers/tty/serial/sh-sci.c | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ad2c189e8fc8..574f68ba50ff 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2899,13 +2899,6 @@ static int sci_init_single(struct platform_device *dev,
port->mapbase = res->start;
sci_port->reg_size = resource_size(res);

- for (i = 0; i < ARRAY_SIZE(sci_port->irqs); ++i) {
- if (i)
- sci_port->irqs[i] = platform_get_irq_optional(dev, i);
- else
- sci_port->irqs[i] = platform_get_irq(dev, i);
- }
-
/* The SCI generates several interrupts. They can be muxed together or
* connected to different interrupt lines. In the muxed case only one
* interrupt resource is specified as there is only one interrupt ID.
@@ -2913,12 +2906,17 @@ static int sci_init_single(struct platform_device *dev,
* from the SCI, however those signals might have their own individual
* interrupt ID numbers, or muxed together with another interrupt.
*/
+ sci_port->irqs[0] = platform_get_irq(dev, 0);
if (sci_port->irqs[0] < 0)
- return -ENXIO;
+ return sci_port->irqs[0];

- if (sci_port->irqs[1] < 0)
- for (i = 1; i < ARRAY_SIZE(sci_port->irqs); i++)
+ for (i = 1; i < ARRAY_SIZE(sci_port->irqs); ++i) {
+ sci_port->irqs[i] = platform_get_irq_optional(dev, i);
+ if (sci_port->irqs[i] < 0)
+ return sci_port->irqs[i];
+ if (sci_port->irqs[i] == 0)
sci_port->irqs[i] = sci_port->irqs[0];
+ }

sci_port->params = sci_probe_regmap(p);
if (unlikely(sci_port->params == NULL))
--
2.30.2