linux-kernel - Re: [tip:irq/genirq] genirq: do not execute DEBUG

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Date:	Thu, 02 Apr 2009 21:11:44 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	henrix@...o.pt, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/genirq] genirq: do not execute DEBUG_SHIRQ when irq
 setup failed

On Thu, 2009-04-02 at 17:21 +0200, Thomas Gleixner wrote:
> On Thu, 2 Apr 2009, Jaswinder Singh Rajput wrote:
> > On Thu, 2009-04-02 at 14:03 +0000, Luis Henriques wrote:
> > > Commit-ID:  ba71604fad348656071a2a76eef9a67dab85a773
> > > Gitweb:     http://git.kernel.org/tip/ba71604fad348656071a2a76eef9a67dab85a773
> > > Author:     Luis Henriques <henrix@...o.pt>
> > > AuthorDate: Wed, 1 Apr 2009 18:06:35 +0100
> > > Committer:  Thomas Gleixner <tglx@...utronix.de>
> > > CommitDate: Thu, 2 Apr 2009 16:02:39 +0200
> > > 
> > > genirq: do not execute DEBUG_SHIRQ when irq setup failed
> > > 
> > > When requesting an IRQ, the DEBUG_SHIRQ code executes a fake IRQ just to make
> > > sure the driver is ready to receive an IRQ immediately.  The problem was that
> > > this fake IRQ was being executed even if interrupt line failed to be allocated
> > > by __setup_irq.
> > > 
> > > Signed-off-by: Luis Henriques <henrix@...o.pt>
> > > LKML-Reference: <20090401170635.GA4392@...es.domain.com>
> > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > > 
> > > 
> > > ---
> > >  kernel/irq/manage.c |    2 +-
> > >  1 files changed, 1 insertions(+), 1 deletions(-)
> > > 
> > > diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> > > index 1516ab7..beeb7d1 100644
> > > --- a/kernel/irq/manage.c
> > > +++ b/kernel/irq/manage.c
> > > @@ -768,7 +768,7 @@ int request_irq(unsigned int irq, irq_handler_t handler,
> > >  		kfree(action);
> > >  
> > >  #ifdef CONFIG_DEBUG_SHIRQ
> > > -	if (irqflags & IRQF_SHARED) {
> > > +	if (!retval & (irqflags & IRQF_SHARED)) {
> > >  		/*
> > >  		 * It's a shared IRQ -- the driver ought to be prepared for it
> > >  		 * to happen immediately, so let's make sure....
> > 
> > What is this ?
> 
> You looking at the wrong place.
>  
> > There is no retval:
> > 
> > http://git.kernel.org/?p=linux/kernel/git/x86/linux-2.6-tip.git;a=blob;f=kernel/irq/manage.c;h=a3eb7baf1e46f2c735edb4cc44e0386cfbc4989e;hb=HEAD
> 
> Care to read patches you want to comment on carefully _BEFORE_ you
> start yelling at people and sending useless copies of the wrong
> function around the world.
> 
> The patch is perfectly fine and already applied.
> 

Yes, I know somehow you applied it. When you will merge this branch with
-tip/master then you will understand what I am saying.

Even function name is changed from:

713 int request_irq(unsigned int irq, irq_handler_t handler,
714
                unsigned long irqflags, const char *devname, void *dev_id)
715 {
716         struct irqaction *action;
717         struct irq_desc *desc;
718         int retval;

to:

857 int request_threaded_irq(unsigned int irq, irq_handler_t handler,
858
                         irq_handler_t thread_fn, unsigned long irqflags,
859                          const char *devname, void *dev_id)
860 {
861         struct irqaction *action;
862         struct irq_desc *desc;
863         int retval;


--
JSR

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