linux-kernel - [PATCH 6/6] gpio: ws16c48: Ensure number of irq matches number of base

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Message-Id: <f90ee47388495677191edf3cfb94801cce09a6f6.1660839809.git.william.gray@linaro.org>
Date:   Thu, 18 Aug 2022 12:28:15 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     linux-iio@...r.kernel.or, linux-gpio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linus.walleij@...aro.org,
        brgl@...ev.pl, William Breathitt Gray <william.gray@...aro.org>
Subject: [PATCH 6/6] gpio: ws16c48: Ensure number of irq matches number of base

The ws16c48 module calls devm_request_irq() for each device. If the
number of irq passed to the module does not match the number of base, a
default value of 0 is passed to devm_request_irq(). IRQ 0 is probably
not what the user wants, so utilize the module_isa_driver_with_irq macro
to ensure the number of irq matches the number of base.

Signed-off-by: William Breathitt Gray <william.gray@...aro.org>
---
 drivers/gpio/gpio-ws16c48.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index b098f2dc196b..88410da91aaf 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -27,7 +27,8 @@ module_param_hw_array(base, uint, ioport, &num_ws16c48, 0);
 MODULE_PARM_DESC(base, "WinSystems WS16C48 base addresses");
 
 static unsigned int irq[MAX_NUM_WS16C48];
-module_param_hw_array(irq, uint, irq, NULL, 0);
+static unsigned int num_irq;
+module_param_hw_array(irq, uint, irq, &num_irq, 0);
 MODULE_PARM_DESC(irq, "WinSystems WS16C48 interrupt line numbers");
 
 /**
@@ -497,7 +498,7 @@ static struct isa_driver ws16c48_driver = {
 	},
 };
 
-module_isa_driver(ws16c48_driver, num_ws16c48);
+module_isa_driver_with_irq(ws16c48_driver, num_ws16c48, num_irq);
 
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@...il.com>");
 MODULE_DESCRIPTION("WinSystems WS16C48 GPIO driver");
-- 
2.37.2