[PATCH 1/7] gpio: graniterapids: Fix vGPIO driver crash

[Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>]

From: Alan Borzeszkowski <alan.borzeszkowski@xxxxxxxxxxxxxxx>

Move setting irq_chip.name from probe() function to the initialization
of "irq_chip" struct in order to fix vGPIO driver crash during bootup.

Crash was caused by unauthorized modification of irq_chip.name field
where irq_chip struct was initialized as const.

This behavior is a consequence of suboptimal implementation of
gpio_irq_chip_set_chip(), which should be changed to avoid
casting away const qualifier.

Crash log:
BUG: unable to handle page fault for address: ffffffffc0ba81c0
/#PF: supervisor write access in kernel mode
/#PF: error_code(0x0003) - permissions violation
CPU: 33 UID: 0 PID: 1075 Comm: systemd-udevd Not tainted 6.12.0-rc6-00077-g2e1b3cc9d7f7 #1
Hardware name: Intel Corporation Kaseyville RP/Kaseyville RP, BIOS KVLDCRB1.PGS.0026.D73.2410081258 10/08/2024
RIP: 0010:gnr_gpio_probe+0x171/0x220 [gpio_graniterapids]

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@xxxxxxxxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
 drivers/gpio/gpio-graniterapids.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-graniterapids.c b/drivers/gpio/gpio-graniterapids.c
index f2e911a3d2ca..9da2999dc30f 100644
--- a/drivers/gpio/gpio-graniterapids.c
+++ b/drivers/gpio/gpio-graniterapids.c
@@ -234,6 +234,7 @@ static int gnr_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 }
 
 static const struct irq_chip gnr_gpio_irq_chip = {
+	.name		= "gpio-graniterapids",
 	.irq_ack	= gnr_gpio_irq_ack,
 	.irq_mask	= gnr_gpio_irq_mask,
 	.irq_unmask	= gnr_gpio_irq_unmask,
@@ -324,7 +325,6 @@ static int gnr_gpio_probe(struct platform_device *pdev)
 
 	girq = &priv->gc.irq;
 	gpio_irq_chip_set_chip(girq, &gnr_gpio_irq_chip);
-	girq->chip->name	= dev_name(dev);
 	girq->parent_handler	= NULL;
 	girq->num_parents	= 0;
 	girq->parents		= NULL;
-- 
2.45.2