diff mbox series

gpio: mpc8xxx: Add shutdown function.

Message ID 20200409090259.13126-1-hui.song_1@nxp.com
State Superseded
Headers show
Series gpio: mpc8xxx: Add shutdown function. | expand

Commit Message

Hui Song April 9, 2020, 9:02 a.m. UTC 
From: Song Hui <hui.song_1@nxp.com>

When the kexec command is executed, the memory area will be re-paginated.
The shutdown function needed to make interrupt handler to be NULL.If
not, an interrupt will be generated during this period. When the interrupt
handler is executed,the handler function address changed and crash will
occur.

Signed-off-by: Song Hui <hui.song_1@nxp.com>
---
 drivers/gpio/gpio-mpc8xxx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 604dfec..a24e6c5 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -446,9 +446,21 @@  static int mpc8xxx_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int mpc8xxx_shutdown(struct platform_device *pdev)
+{
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
+
+	if (mpc8xxx_gc->irq) {
+		irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
+		irq_domain_remove(mpc8xxx_gc->irq);
+	}
+
+	return 0;
+}
 static struct platform_driver mpc8xxx_plat_driver = {
 	.probe		= mpc8xxx_probe,
 	.remove		= mpc8xxx_remove,
+	.shutdown	= mpc8xxx_shutdown,
 	.driver		= {
 		.name = "gpio-mpc8xxx",
 		.of_match_table	= mpc8xxx_gpio_ids,