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

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Date:   Wed,  7 Apr 2021 13:17:13 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v2 1/1] serial: sh-sci: Respect deferred probe when getting IRQ

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@...ck-us.net>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.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