From: Robert Jarzmik robert.jarzmik@free.fr
[ Upstream commit 9ce3ebe973bf4073426f35f282c6b955ed802765 ]
In the corner case where the gpio driver probe fails, for whatever reason, the suspend and resume handlers will still be called as they have to be registered as syscore operations. This applies as well when no probe was called while the driver has been built in the kernel.
Nicolas tracked this in : https://bugzilla.kernel.org/show_bug.cgi?id=200905
Therefore, add a failsafe in these function, and test if a proper probe succeeded and the driver is functional.
Signed-off-by: Robert Jarzmik robert.jarzmik@free.fr Reported-by: Nicolas Chauvet kwizart@gmail.com Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpio-pxa.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c index eb27fa76e8fc..bcc6be4a5cb2 100644 --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -777,6 +777,9 @@ static int pxa_gpio_suspend(void) struct pxa_gpio_bank *c; int gpio;
+ if (!pchip) + return 0; + for_each_gpio_bank(gpio, c, pchip) { c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET); c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET); @@ -795,6 +798,9 @@ static void pxa_gpio_resume(void) struct pxa_gpio_bank *c; int gpio;
+ if (!pchip) + return; + for_each_gpio_bank(gpio, c, pchip) { /* restore level with set/clear */ writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);