[PATCH 1/2] pinctrl: bcm2835: Fix permissions of persist_gpio_outputs

[Stefan Wahren]

The commit 8ff05989b44e ("pinctrl: bcm2835: Make pin freeing behavior
configurable") unintentionally made the module parameter
persist_gpio_outputs changeable at runtime. So drop the write permission
in order to make the freeing behavior predictable for user applications.

Fixes: 8ff05989b44e ("pinctrl: bcm2835: Make pin freeing behavior configurable")
Reported-by: Andy Shevchenko <andy.shevchenko at gmail.com>
Closes: https://lore.kernel.org/linux-gpio/Zjk-C0nLmlynqLAE@surfacebook.localdomain/
Signed-off-by: Stefan Wahren <wahrenst at gmx.net>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index 7178a38475cc..27fd54795791 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -245,7 +245,7 @@ static const char * const irq_type_names[] = {
 };

 static bool persist_gpio_outputs;
-module_param(persist_gpio_outputs, bool, 0644);
+module_param(persist_gpio_outputs, bool, 0444);
 MODULE_PARM_DESC(persist_gpio_outputs, "Enable GPIO_OUT persistence when pin is freed");

 static inline u32 bcm2835_gpio_rd(struct bcm2835_pinctrl *pc, unsigned reg)
--
2.34.1