[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Mon, 10 Sep 2012 00:55:27 +0530
From: raghu.prabhu13@...il.com
To: jeremy@...p.org, mingo@...hat.com, x86@...nel.org
Cc: Raghavendra D Prabhu <rprabhu@...hang.net>,
Thomas Gleixner <tglx@...utronix.de> (maintainer:X86
ARCHITECTURE...,commit_signer:2/11=18%),
"H. Peter Anvin" <hpa@...or.com> (maintainer:X86 ARCHITECTURE...),
liu chuansheng <chuansheng.liu@...el.com> (commit_signer:2/11=18%),
Fernando Luis Vazquez Cao <fernando@....ntt.co.jp> (commit_signer:2/11=18%),
Paul Gortmaker <paul.gortmaker@...driver.com> (commit_signer:1/11=9%),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] IRQ: Add a check for uninitialized irqs.
From: Raghavendra D Prabhu <rprabhu@...hang.net>
Errors like "do_IRQ: 0.84 No Irq handler for vector (irq -1)" have been reported
earlier filling up the console/logs. So this adds a condition to check for
uninitialized irqs so that it exits early and doesn't proceed further. Also, irq
is made a signed integer, since if it is not mapped to a vector, it will be
assigned -1 which will be UINT_MAX otherwise.
Signed-off-by: Raghavendra D Prabhu <rprabhu@...hang.net>
---
arch/x86/kernel/irq.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index d44f782..ddba63a 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -184,21 +184,24 @@ unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
/* high bit used in ret_from_ code */
unsigned vector = ~regs->orig_ax;
- unsigned irq;
+ int irq;
irq_enter();
exit_idle();
- irq = __this_cpu_read(vector_irq[vector]);
+ if (unlikely((irq = __this_cpu_read(vector_irq[vector])) == -1)) {
+ pr_emerg_ratelimited("IRQ handler not setup for vector %u", vector);
+ goto err_exit;
+ }
if (!handle_irq(irq, regs)) {
ack_APIC_irq();
- if (printk_ratelimit())
- pr_emerg("%s: %d.%d No irq handler for vector (irq %d)\n",
- __func__, smp_processor_id(), vector, irq);
+ pr_emerg_ratelimited("%s: %d.%d No irq handler for vector (irq %u)\n",
+ __func__, smp_processor_id(), vector, irq);
}
+err_exit:
irq_exit();
set_irq_regs(old_regs);
--
1.7.12
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists