4.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Meelis Roos <mroos@xxxxxxxx>
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801301935410.1797@nanos
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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);