[PATCH] [sh/highlander] psw: Add error handling in psw_irq_handler

From: Haoran Liu
Date: Wed Nov 29 2023 - 02:39:27 EST


This patch adds error handling for the platform_get_drvdata call
within the psw_irq_handler function in
arch/sh/boards/mach-highlander/psw.c. Previously, the absence of
error checking could lead to unexpected behavior if
platform_get_drvdata returned a null pointer.

Signed-off-by: Haoran Liu <liuhaoran14@xxxxxxx>
---
arch/sh/boards/mach-highlander/psw.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/sh/boards/mach-highlander/psw.c b/arch/sh/boards/mach-highlander/psw.c
index d445c54f74e4..fa18a56a0894 100644
--- a/arch/sh/boards/mach-highlander/psw.c
+++ b/arch/sh/boards/mach-highlander/psw.c
@@ -21,6 +21,12 @@ static irqreturn_t psw_irq_handler(int irq, void *arg)
unsigned int l, mask;
int ret = 0;

+ if (!psw) {
+ pr_err("psw_irq_handler: No push_switch data associated "
+ "with platform_device\n");
+ return IRQ_NONE;
+ }
+
l = __raw_readw(PA_DBSW);

/* Nothing to do if there's no state change */
--
2.17.1