| Message ID | 20200907153135.3307-1-a.fatoum@pengutronix.de |
|---|---|
| State | Accepted |
| Commit | 45ccf6556720293323c20cda717756014ff63007 |
| Headers | show |
| Series | [v2] gpio: siox: explicitly support only threaded irqs | expand |
On Wed, Sep 09, 2020 at 11:43:24AM +0200, Bartosz Golaszewski wrote: > On Mon, Sep 7, 2020 at 5:32 PM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote: > > > > The gpio-siox driver uses handle_nested_irq() to implement its > > interrupt support. This is only capable of handling threaded irq > > actions. For a hardirq action it triggers a NULL pointer oops. > > (It calls action->thread_fn which is NULL then.) > > > > Prevent registration of a hardirq action by setting > > gpio_irq_chip::threaded to true. > > > > Cc: u.kleine-koenig@pengutronix.de > > Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> > > --- > > Could you add a Fixes tag? This looks like stable material. Ah, we talked about this in the v1 thread---tglx and I agreed we want it. That's: Fixes: be8c8facc707 ("gpio: new driver to work with a 8x12 siox") Best regards Uwe
On Wed, Sep 9, 2020 at 12:30 PM Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote: > > On Wed, Sep 09, 2020 at 11:43:24AM +0200, Bartosz Golaszewski wrote: > > On Mon, Sep 7, 2020 at 5:32 PM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote: > > > > > > The gpio-siox driver uses handle_nested_irq() to implement its > > > interrupt support. This is only capable of handling threaded irq > > > actions. For a hardirq action it triggers a NULL pointer oops. > > > (It calls action->thread_fn which is NULL then.) > > > > > > Prevent registration of a hardirq action by setting > > > gpio_irq_chip::threaded to true. > > > > > > Cc: u.kleine-koenig@pengutronix.de > > > Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> > > > --- > > > > Could you add a Fixes tag? This looks like stable material. > > Ah, we talked about this in the v1 thread---tglx and I agreed we want > it. That's: > > Fixes: be8c8facc707 ("gpio: new driver to work with a 8x12 siox") > Thanks, now queued for fixes. Bartosz
diff --git a/drivers/gpio/gpio-siox.c b/drivers/gpio/gpio-siox.c index 26e1fe092304..f8c5e9fc4bac 100644 --- a/drivers/gpio/gpio-siox.c +++ b/drivers/gpio/gpio-siox.c @@ -245,6 +245,7 @@ static int gpio_siox_probe(struct siox_device *sdevice) girq->chip = &ddata->ichip; girq->default_type = IRQ_TYPE_NONE; girq->handler = handle_level_irq; + girq->threaded = true; ret = devm_gpiochip_add_data(dev, &ddata->gchip, NULL); if (ret)
The gpio-siox driver uses handle_nested_irq() to implement its interrupt support. This is only capable of handling threaded irq actions. For a hardirq action it triggers a NULL pointer oops. (It calls action->thread_fn which is NULL then.) Prevent registration of a hardirq action by setting gpio_irq_chip::threaded to true. Cc: u.kleine-koenig@pengutronix.de Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> --- v1 -> v2: reworded commit message (Uwe) --- drivers/gpio/gpio-siox.c | 1 + 1 file changed, 1 insertion(+)