lkml.org 
[lkml]   [2020]   [Aug]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] genirq: Unlock irq descriptor after errors
Date
In irq_set_irqchip_state(), the irq descriptor is not unlocked
after an error is encountered. While that should never happen
in practice, a buggy driver may trigger it. This would result
in a lockup, so let's fix it.

Fixes: 1d0326f352bb ("genirq: Check irq_data_get_irq_chip() return value before use")
Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
kernel/irq/manage.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d55ba625d426..52ac5391dcc6 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2731,8 +2731,10 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,

do {
chip = irq_data_get_irq_chip(data);
- if (WARN_ON_ONCE(!chip))
- return -ENODEV;
+ if (WARN_ON_ONCE(!chip)) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
if (chip->irq_set_irqchip_state)
break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
@@ -2745,6 +2747,7 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
if (data)
err = chip->irq_set_irqchip_state(data, which, val);

+out_unlock:
irq_put_desc_busunlock(desc, flags);
return err;
}
--
2.17.1
\
 
 \ /
  Last update: 2020-08-11 20:01    [W:0.053 / U:0.780 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site