| Message ID | 1432207297-16887-1-git-send-email-geert+renesas@glider.be |
|---|---|
| State | New |
| Headers | show |
On Thu, May 21, 2015 at 1:21 PM, Geert Uytterhoeven <geert+renesas@glider.be> wrote: > If an interrupt controller doesn't support wake-up configuration, > irq_set_irq_wake() returns an error code. Then any subsequent call > trying to deconfigure wake-up will cause an imbalance, and a warning > will be printed: > > WARNING: CPU: 1 PID: 1341 at kernel/irq/manage.c:540 irq_set_irq_wake+0x9c/0xf8() > Unbalanced IRQ 26 wake disable > > To fix this, refrain from any further parent interrupt controller > (de)configuration if irq_set_irq_wake() failed. > > Alternative fixes would be: > - calling "gic_set_irqchip_flags(IRQCHIP_SKIP_SET_WAKE)" from the > platform code, > - setting "gic_chip.flags = IRQCHIP_SKIP_SET_WAKE" in the GIC driver > code, > but these were withheld as the GIC hardware doesn't really support > wake-up interrupts. > > Fixes: ab82fa7da4dce5c7 ("gpio: rcar: Prevent module clock disable when wake-up is enabled") > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- > v2: > - Reworded patch description, > - Moved alternatives into the patch description. Patch applied. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c index fd39774659484fa6..1e14a6c74ed13941 100644 --- a/drivers/gpio/gpio-rcar.c +++ b/drivers/gpio/gpio-rcar.c @@ -177,8 +177,17 @@ static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on) struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct gpio_rcar_priv *p = container_of(gc, struct gpio_rcar_priv, gpio_chip); - - irq_set_irq_wake(p->irq_parent, on); + int error; + + if (p->irq_parent) { + error = irq_set_irq_wake(p->irq_parent, on); + if (error) { + dev_dbg(&p->pdev->dev, + "irq %u doesn't support irq_set_wake\n", + p->irq_parent); + p->irq_parent = 0; + } + } if (!p->clk) return 0;
If an interrupt controller doesn't support wake-up configuration, irq_set_irq_wake() returns an error code. Then any subsequent call trying to deconfigure wake-up will cause an imbalance, and a warning will be printed: WARNING: CPU: 1 PID: 1341 at kernel/irq/manage.c:540 irq_set_irq_wake+0x9c/0xf8() Unbalanced IRQ 26 wake disable To fix this, refrain from any further parent interrupt controller (de)configuration if irq_set_irq_wake() failed. Alternative fixes would be: - calling "gic_set_irqchip_flags(IRQCHIP_SKIP_SET_WAKE)" from the platform code, - setting "gic_chip.flags = IRQCHIP_SKIP_SET_WAKE" in the GIC driver code, but these were withheld as the GIC hardware doesn't really support wake-up interrupts. Fixes: ab82fa7da4dce5c7 ("gpio: rcar: Prevent module clock disable when wake-up is enabled") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v2: - Reworded patch description, - Moved alternatives into the patch description. --- drivers/gpio/gpio-rcar.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)