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genirq: Make legacy autoprobing work again 

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: c942cee46b ("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>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/alpine.DEB.2.20.1801301935410.1797@nanos
This commit is contained in:
Thomas Gleixner 2018-01-30 19:36:32 +01:00
parent 8de50dc262
commit 1beaeacdc8
3 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/irq/autoprobe.c
View File

@ -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);

6
kernel/irq/chip.c
View File

@ -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);

2
kernel/irq/internals.h
View File

@ -76,7 +76,7 @@ extern void __enable_irq(struct irq_desc *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);