linux-kernel - Re: [PATCH v3 2/4] genirq: Inform handler about line sharing state

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Date:	Tue, 14 Dec 2010 22:46:46 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jan Kiszka <jan.kiszka@....de>
cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org>,
	Tom Lyon <pugs@...co.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH v3 2/4] genirq: Inform handler about line sharing state

On Mon, 13 Dec 2010, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
>  	chip_bus_lock(desc);
>  	retval = __setup_irq(irq, desc, action);
>  	chip_bus_sync_unlock(desc);
>  
> -	if (retval)
> +	if (retval) {
> +		if (desc->action && !desc->action->next)
> +			desc->irq_data.drv_status &= ~IRQS_SHARED;

This is redundant. IRQS_SHARED gets set in a code path where all
checks are done already.

To make that more obvious we can set it right before

   raw_spin_unlock_irqrestore(&desc->lock, flags);

conditionally on (shared).

That way we can also move the kfree out of the mutex locked section.

Thanks,

	tglx
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