linux-kernel - Re: [PATCH v3] PCI: hosts: mark pcie/pci (msi) irq cascade handler as IRQF_NO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160113133904.GD29964@linutronix.de>
Date:	Wed, 13 Jan 2016 14:39:04 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Grygorii Strashko <grygorii.strashko@...com>,
	linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	tony@...mide.com, nsekhar@...com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kishon Vijay Abraham I <kishon@...com>,
	Jingoo Han <jingoohan1@...il.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Richard Zhu <Richard.Zhu@...escale.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Thierry Reding <thierry.reding@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Pratyush Anand <pratyush.anand@...il.com>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH v3] PCI: hosts: mark pcie/pci (msi) irq cascade handler
 as IRQF_NO_THREAD

* Bjorn Helgaas | 2016-01-06 16:18:27 [-0600]:

>Hi Bjorn,

>> diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
>> index 8c36880..0415192 100644
>> --- a/drivers/pci/host/pci-dra7xx.c
>> +++ b/drivers/pci/host/pci-dra7xx.c
>> @@ -301,8 +301,19 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
>>  		return -EINVAL;
>>  	}
>>  
>> +	/*
>> +	 * Mark dra7xx_pcie_msi IRQ as IRQF_NO_THREAD
>> +	 * On -RT and if kernel is booting with "threadirqs" cmd line parameter
>> +	 * the dra7xx_pcie_msi_irq_handler() will be forced threaded but,
>> +	 * in the same time, it's IRQ dispatcher and calls generic_handle_irq(),
>> +	 * which, in turn, will be resolved to handle_simple_irq() call.
>> +	 * The handle_simple_irq() expected to be called with IRQ disabled, as
>> +	 * result kernle will display warning:
>> +	 * "irq XXX handler YYY+0x0/0x14 enabled interrupts".
>> +	 */

could you _please_ remove this coment? This kind of comment (if at all)
should be part of the commit message (which is the case more or less).

>>  	ret = devm_request_irq(&pdev->dev, pp->irq,
>> -			       dra7xx_pcie_msi_irq_handler, IRQF_SHARED,
>> +			       dra7xx_pcie_msi_irq_handler,
>> +			       IRQF_SHARED | IRQF_NO_THREAD,
>>  			       "dra7-pcie-msi",	pp);
>>  	if (ret) {
>>  		dev_err(&pdev->dev, "failed to request irq\n");
>> diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c

Sebastian