This is a note to let you know that I've just added the patch titled

genirq: Make legacy autoprobing work again

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: genirq-make-legacy-autoprobing-work-again.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 1beaeacdc88b537703d04d5536235d0bbb36db93 Mon Sep 17 00:00:00 2001

From: Thomas Gleixner tglx@linutronix.de Date: Tue, 30 Jan 2018 19:36:32 +0100 Subject: genirq: Make legacy autoprobing work again

From: Thomas Gleixner tglx@linutronix.de

commit 1beaeacdc88b537703d04d5536235d0bbb36db93 upstream.

Meelis reported the following warning on a quad P3 HP NetServer museum piece:

WARNING: CPU: 3 PID: 258 at kernel/irq/chip.c:244 __irq_startup+0x80/0x100 EIP: __irq_startup+0x80/0x100 irq_startup+0x7e/0x170 probe_irq_on+0x128/0x2b0 parport_irq_probe.constprop.18+0x8d/0x1af [parport_pc] parport_pc_probe_port+0xf11/0x1260 [parport_pc] parport_pc_init+0x78a/0xf10 [parport_pc] parport_parse_param.constprop.16+0xf0/0xf0 [parport_pc] do_one_initcall+0x45/0x1e0

This is caused by the rewrite of the irq activation/startup sequence which missed to convert a callsite in the irq legacy auto probing code.

To fix this irq_activate_and_startup() needs to gain a return value so the pending logic can work proper.

Fixes: c942cee46bba ("genirq: Separate activation and startup") Reported-by: Meelis Roos mroos@linux.ee Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Meelis Roos mroos@linux.ee Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801301935410.1797@nanos Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- kernel/irq/autoprobe.c | 2 +- kernel/irq/chip.c | 6 +++--- kernel/irq/internals.h | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-)

--- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -71,7 +71,7 @@ unsigned long probe_irq_on(void) raw_spin_lock_irq(&desc->lock); if (!desc->action && irq_settings_can_probe(desc)) { desc->istate |= IRQS_AUTODETECT | IRQS_WAITING; - if (irq_startup(desc, IRQ_NORESEND, IRQ_START_FORCE)) + if (irq_activate_and_startup(desc, IRQ_NORESEND)) desc->istate |= IRQS_PENDING; } raw_spin_unlock_irq(&desc->lock); --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -294,11 +294,11 @@ int irq_activate(struct irq_desc *desc) return 0; }

-void irq_activate_and_startup(struct irq_desc *desc, bool resend) +int irq_activate_and_startup(struct irq_desc *desc, bool resend) { if (WARN_ON(irq_activate(desc))) - return; - irq_startup(desc, resend, IRQ_START_FORCE); + return 0; + return irq_startup(desc, resend, IRQ_START_FORCE); }

static void __irq_disable(struct irq_desc *desc, bool mask); --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -76,7 +76,7 @@ extern void __enable_irq(struct irq_desc #define IRQ_START_COND false

extern int irq_activate(struct irq_desc *desc); -extern void irq_activate_and_startup(struct irq_desc *desc, bool resend); +extern int irq_activate_and_startup(struct irq_desc *desc, bool resend); extern int irq_startup(struct irq_desc *desc, bool resend, bool force);

extern void irq_shutdown(struct irq_desc *desc);

Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.15/clocksource-drivers-stm32-fix-kernel-panic-with-multiple-timers.patch queue-4.15/genirq-make-legacy-autoprobing-work-again.patch queue-4.15/sched-rt-use-container_of-to-get-root-domain-in-rto_push_irq_work_func.patch queue-4.15/sched-rt-up-the-root-domain-ref-count-when-passing-it-around-via-ipis.patch