From patchwork Sat Aug 25 08:44:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: gpio: pxa: handle corner case of unprobed device X-Patchwork-Submitter: Robert Jarzmik X-Patchwork-Id: 962145 Message-Id: <20180825084417.13526-1-robert.jarzmik@free.fr> To: Robert Jarzmik , Linus Walleij Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Date: Sat, 25 Aug 2018 10:44:17 +0200 From: Robert Jarzmik List-Id: 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 Reported-by: Nicolas Chauvet --- 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 c18712dabf93..bfe4c5c9f41c 100644 --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -776,6 +776,9 @@ 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); @@ -794,6 +797,9 @@ 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);