Re: [PATCH] x86: check for valid irq_cfg pointer insmp_irq_move_cleanup_interrupt

[Suresh Siddha]

On Mon, 2012-05-21 at 16:09 -0500, Dimitri Sivanich wrote:
> On Mon, May 21, 2012 at 02:05:53PM -0700, Suresh Siddha wrote:
> > On Mon, 2012-05-21 at 11:49 -0500, Dimitri Sivanich wrote:
> > > The smp_irq_move_cleanup_interrupt routine should be checking for a valid
> > > irq_cfg pointer prior to accessing it.  It also seems that this should be
> > > done after taking the desc lock.
> > 
> > I think these changes are correct. Did you see any crashes during module
> > unload etc?
> 
> Yes, we have seen these on occasion during boot.

During boot or shutdown?

Review of the code shows that this can trigger during module unload
which can call destroy_irq() etc and can trigger the crash if there is a
parallel irq migration related cleanup.

Unsuccessful module loads can also call destroy_irq() but I doubt that
is what happening here.

thanks,
suresh


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