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Date: Tue, 10 Aug 2021 19:30:49 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Rasmus Villemoes <linux@...musvillemoes.dk>, Bartosz Golaszewski <bgolaszewski@...libre.com> Subject: [PATCH 5.13 141/175] Revert "gpio: mpc8xxx: change the gpio interrupt flags." From: Rasmus Villemoes <linux@...musvillemoes.dk> commit ec7099fdea8025988710ee6fecfd4e4210c29ab5 upstream. This reverts commit 3d5bfbd9716318b1ca5c38488aa69f64d38a9aa5. When booting with threadirqs, it causes a splat WARNING: CPU: 0 PID: 29 at kernel/irq/handle.c:159 __handle_irq_event_percpu+0x1ec/0x27c irq 66 handler irq_default_primary_handler+0x0/0x1c enabled interrupts That splat later went away with commit 81e2073c175b ("genirq: Disable interrupts for force threaded handlers"), which got backported to -stable. However, when running an -rt kernel, the splat still exists. Moreover, quoting Thomas Gleixner [1] But 3d5bfbd97163 ("gpio: mpc8xxx: change the gpio interrupt flags.") has nothing to do with that: "Delete the interrupt IRQF_NO_THREAD flags in order to gpio interrupts can be threaded to allow high-priority processes to preempt." This changelog is blatantly wrong. In mainline forced irq threads have always been invoked with softirqs disabled, which obviously makes them non-preemptible. So the patch didn't even do what its commit log said. [1] https://lore.kernel.org/lkml/871r8zey88.ffs@nanos.tec.linutronix.de/ Cc: stable@...r.kernel.org # v5.9+ Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/gpio/gpio-mpc8xxx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpio/gpio-mpc8xxx.c +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -405,7 +405,7 @@ static int mpc8xxx_probe(struct platform ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn, mpc8xxx_gpio_irq_cascade, - IRQF_SHARED, "gpio-cascade", + IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade", mpc8xxx_gc); if (ret) { dev_err(&pdev->dev,
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