linux-kernel - Re: [patch 09/16] genirq: Add generic msi irq domain support

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Message-ID: <alpine.DEB.2.11.1411181520580.3909@nanos>
Date:	Tue, 18 Nov 2014 15:24:02 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 09/16] genirq: Add generic msi irq domain support

On Tue, 18 Nov 2014, Yun Wu (Abel) wrote:
> On 2014/11/18 20:49, Jiang Liu wrote:
> >>> +	ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
> >>> +	if (ret < 0)
> >>> +		return ret;
> >>> +
> >>> +	for (i = 0; i < nr_irqs; i++) {
> >>> +		ret = ops->msi_init(domain, info, virq + i, hwirq + i, arg);
> >>> +		if (ret < 0) {
> >>> +			if (ops->msi_free) {
> >>> +				for (i--; i > 0; i--)
> >>
> >> while (i--) ?

The allocation for 'i' failed. So we don't free i. You missed the real
bug here:

> >>> +				for (i--; i > 0; i--)

Must be i >= 0.

Thanks,

	tglx
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