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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org,
	Zwane Mwaikambo <zwane@infradead.org>,
	Ashok Raj <ashok.raj@intel.com>, Ingo Molnar <mingo@elte.hu>,
	"Lu, Yinghai" <yinghai.lu@amd.com>,
	Natalie Protasevich <protasnb@gmail.com>, Andi Kleen <ak@suse.de>,
	"Siddha, Suresh B" <suresh.b.siddha@intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 14/14] genirq: Mask irqs when migrating them.
Date: Fri, 23 Feb 2007 18:06:55 -0800	[thread overview]
Message-ID: <20070223180655.B2120@unix-os.sc.intel.com> (raw)
In-Reply-To: <m1hctdt7ub.fsf_-_@ebiederm.dsl.xmission.com>; from ebiederm@xmission.com on Fri, Feb 23, 2007 at 04:46:20AM -0700

Andrew, This is a bug fix and must go in before 2.6.21.

Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>

On Fri, Feb 23, 2007 at 04:46:20AM -0700, Eric W. Biederman wrote:
> 
> move_native_irqs tries to do the right thing when migrating irqs
> by disabling them.  However disabling them is a software logical
> thing, not a hardware thing.  This has always been a little flaky
> and after Ingo's latest round of changes it is guaranteed to not
> mask the apic.
> 
> So this patch fixes move_native_irq to directly call the mask and
> unmask chip methods to guarantee that we mask the irq when we
> are migrating it.  We must do this as it is required by
> all code that call into the path.
> 
> Since we don't know the masked status when IRQ_DISABLED is
> set so we will not be able to restore it.   The patch makes the code
> just give up and trying again the next time this routing is called.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
> ---
>  kernel/irq/migration.c |    9 ++++-----
>  1 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
> index 4baa3bb..77b7acc 100644
> --- a/kernel/irq/migration.c
> +++ b/kernel/irq/migration.c
> @@ -65,12 +65,11 @@ void move_native_irq(int irq)
>  	if (likely(!(desc->status & IRQ_MOVE_PENDING)))
>  		return;
>  
> -	if (likely(!(desc->status & IRQ_DISABLED)))
> -		desc->chip->disable(irq);
> +	if (unlikely(desc->status & IRQ_DISABLED))
> +		return;
>  
> +	desc->chip->mask(irq);
>  	move_masked_irq(irq);
> -
> -	if (likely(!(desc->status & IRQ_DISABLED)))
> -		desc->chip->enable(irq);
> +	desc->chip->unmask(irq);
>  }
>  
> -- 
> 1.5.0.g53756

  parent reply	other threads:[~2007-02-24  2:42 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <200701221116.13154.luigi.genoni@pirelli.com>
2007-01-22 17:14 ` System crash after "No irq handler for vector" linux 2.6.19 Eric W. Biederman
     [not found]   ` <200701231051.32945.luigi.genoni@pirelli.com>
2007-01-23 12:18     ` Eric W. Biederman
     [not found]       ` <Pine.LNX.4.64.0701232052330.32111@baldios.it.pirelli.com>
2007-01-31  8:39         ` Eric W. Biederman
     [not found]           ` <200701311549.22512.luigi.genoni@pirelli.com>
2007-02-01  5:56             ` [PATCH] x86_64: Survive having no irq mapping for a vector Eric W. Biederman
2007-02-01  5:59             ` System crash after "No irq handler for vector" linux 2.6.19 Eric W. Biederman
2007-02-01  7:20             ` Eric W. Biederman
     [not found]               ` <200702021848.55921.luigi.genoni@pirelli.com>
2007-02-02 18:02                 ` Eric W. Biederman
     [not found]                   ` <200702021905.39922.luigi.genoni@pirelli.com>
2007-02-02 18:32                     ` Eric W. Biederman
2007-02-03  0:31                     ` [PATCH 1/2] x86_64 irq: Simplfy __assign_irq_vector Eric W. Biederman
2007-02-03  0:35                       ` [PATCH 2/2] x86_64 irq: Handle irqs pending in IRR during irq migration Eric W. Biederman
2007-02-03  1:05                         ` Andrew Morton
2007-02-03  1:39                           ` Eric W. Biederman
2007-02-03  2:01                             ` Andrew Morton
2007-02-03  7:32                           ` Arjan van de Ven
2007-02-03  7:55                             ` Eric W. Biederman
2007-02-03 14:31                               ` l.genoni
2007-02-03 10:01                         ` Andi Kleen
2007-02-03 10:22                           ` Eric W. Biederman
2007-02-03 10:26                             ` Andi Kleen
2007-02-06  7:36                         ` Ingo Molnar
2007-02-06  8:57                           ` Eric W. Biederman
     [not found]                           ` <200702061012.25910.luigi.genoni@pirelli.com>
2007-02-06 22:05                             ` Eric W. Biederman
2007-02-06 22:16                           ` Eric W. Biederman
2007-02-06 22:25                             ` Ingo Molnar
2007-02-07  2:33                               ` Eric W. Biederman
2007-02-08 11:48                               ` Eric W. Biederman
2007-02-08 20:19                                 ` Eric W. Biederman
2007-02-09  6:40                                   ` Eric W. Biederman
2007-02-10 23:52                                     ` What are the real ioapic rte programming constraints? Eric W. Biederman
2007-02-11  5:57                                       ` Zwane Mwaikambo
2007-02-11 10:20                                         ` Eric W. Biederman
2007-02-11 16:16                                           ` Zwane Mwaikambo
2007-02-11 22:01                                             ` Eric W. Biederman
2007-02-12  1:05                                               ` Zwane Mwaikambo
2007-02-12  4:51                                                 ` Eric W. Biederman
2007-02-23 10:51                                                   ` Conclusions from my investigation about ioapic programming Eric W. Biederman
2007-02-23 11:10                                                     ` [PATCH 0/14] x86_64 irq related fixes and cleanups Eric W. Biederman
2007-02-23 11:11                                                       ` [PATCH 01/14] x86_64 irq: Simplfy __assign_irq_vector Eric W. Biederman
2007-02-23 11:13                                                         ` [PATCH 02/14] irq: Remove set_native_irq_info Eric W. Biederman
2007-02-23 11:15                                                           ` [PATCH 03/14] x86_64 irq: Kill declaration of removed array, interrupt Eric W. Biederman
2007-02-23 11:16                                                             ` [PATCH 04/14] x86_64 irq: Remove the unused vector parameter from ioapic_register_intr Eric W. Biederman
2007-02-23 11:19                                                               ` [PATCH 05/14] x86_64 irq: Refactor setup_IO_APIC_irq Eric W. Biederman
2007-02-23 11:20                                                                 ` [PATCH 06/14] x86_64 irq: Simplfiy the set_affinity logic Eric W. Biederman
2007-02-23 11:23                                                                   ` [PATCH 07/14] x86_64 irq: In __DO_ACTION perform the FINAL action for every entry Eric W. Biederman
2007-02-23 11:26                                                                     ` [PATCH 08/14] x86_64 irq: Use NR_IRQS not NR_IRQ_VECTORS Eric W. Biederman
2007-02-23 11:32                                                                       ` [PATCH 09/14] x86_64 irq: Begin consolidating per_irq data in structures Eric W. Biederman
2007-02-23 11:35                                                                         ` [PATCH 10/14] x86_64 irq: Simplify assign_irq_vector's arguments Eric W. Biederman
2007-02-23 11:36                                                                           ` [PATCH 11/14] x86_64 irq: Remove unnecessary irq 0 setup Eric W. Biederman
2007-02-23 11:38                                                                             ` [PATCH 12/14] x86_64 irq: Add constants for the reserved IRQ vectors Eric W. Biederman
2007-02-23 11:40                                                                               ` [PATCH 13/14] x86_64 irq: Safely cleanup an irq after moving it Eric W. Biederman
2007-02-25 11:53                                                                                 ` Mika Penttilä
2007-02-25 12:09                                                                                   ` Eric W. Biederman
2007-02-23 11:46                                                                               ` [PATCH 14/14] genirq: Mask irqs when migrating them Eric W. Biederman
2007-02-23 12:01                                                                                 ` [PATCH] x86_64 irq: Document what works and why on ioapics Eric W. Biederman
2007-02-24  2:06                                                                                 ` Siddha, Suresh B [this message]
2007-02-27 20:26                                                                                   ` [PATCH 14/14] genirq: Mask irqs when migrating them Andrew Morton
2007-02-27 20:41                                                                                     ` Eric W. Biederman
2007-02-25 10:43                                                                               ` [PATCH 12/14] x86_64 irq: Add constants for the reserved IRQ vectors Pavel Machek
2007-02-25 11:15                                                                                 ` Eric W. Biederman
2007-02-25 19:48                                                                                   ` Pavel Machek
2007-02-25 21:01                                                                                     ` Eric W. Biederman
2007-02-25 21:13                                                                                       ` Pavel Machek
2007-02-23 16:48                                                     ` Conclusions from my investigation about ioapic programming Jeff V. Merkey
2007-02-23 18:10                                                       ` Eric W. Biederman
2007-02-23 17:48                                                         ` Jeff V. Merkey
2007-02-24  4:05                                                           ` Eric W. Biederman
2007-02-24  5:44                                                             ` Jeffrey V. Merkey
2007-02-23 17:48                                                         ` Jeff V. Merkey
     [not found]                                           ` <32209efe0702111212j77f5011xe2430cb13c13686@mail.gmail.com>
2007-02-11 21:36                                             ` What are the real ioapic rte programming constraints? Eric W. Biederman
2007-02-03  9:50                       ` [PATCH 1/2] x86_64 irq: Simplfy __assign_irq_vector Andi Kleen
2007-02-03  0:40                     ` System crash after "No irq handler for vector" linux 2.6.19 Eric W. Biederman

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