linux-kernel - Re: [PATCH] PCI: designware: Add irq_create

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Date:	Wed, 9 Oct 2013 15:57:16 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Jingoo Han <jg1.han@...sung.com>
CC:	"'Bjorn Helgaas'" <bhelgaas@...gle.com>,
	<linux-pci@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	"'Kukjin Kim'" <kgene.kim@...sung.com>,
	"'Pratyush Anand'" <pratyush.anand@...com>,
	"'Mohit KUMAR'" <Mohit.KUMAR@...com>,
	"'Siva Reddy Kallam'" <siva.kallam@...sung.com>,
	"'SRIKANTH TUMKUR SHIVANAND'" <ts.srikanth@...sung.com>,
	"'Arnd Bergmann'" <arnd@...db.de>,
	"'Sean Cross'" <xobs@...agi.com>,
	"'Thierry Reding'" <thierry.reding@...il.com>,
	"'Thomas Petazzoni'" <thomas.petazzoni@...e-electrons.com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH] PCI: designware: Add irq_create_mapping()

On Wednesday 09 October 2013 03:35 PM, Jingoo Han wrote:
> On Wednesday, October 09, 2013 6:48 PM, Kishon Vijay Abraham I wrote:
>> On Wednesday 09 October 2013 02:47 PM, Jingoo Han wrote:
>>> On Wednesday, October 09, 2013 6:06 PM, Kishon Vijay Abraham I wrote:
>>>> On Wednesday 09 October 2013 01:39 PM, Jingoo Han wrote:
>>>>> Without irq_create_mapping(), the correct irq number cannot be
>>>>> provided. In this case, it makes problem such as NULL deference.
>>>>> Thus, irq_create_mapping() should be added for MSI.
>>>>>
>>>>> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
>>>>> Cc: Kishon Vijay Abraham I <kishon@...com>
>>>>> ---
>>>>> Tested on Exynos5440.
>>>>>
>>>>>  drivers/pci/host/pcie-designware.c |   10 ++++------
>>>>>  drivers/pci/host/pcie-designware.h |    1 +
>>>>>  2 files changed, 5 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
>>>>> index 8963017..e536bb6 100644
>>>>> --- a/drivers/pci/host/pcie-designware.c
>>>>> +++ b/drivers/pci/host/pcie-designware.c
>>>>> @@ -237,6 +237,8 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
>>>>>  		}
>>>>>  	}
>>>>>
>>>>> +	pp->msi_irq_start = irq_create_mapping(pp->irq_domain, 0);
>>>>> +
>>>>
>>>> I think irq_create_mapping should be done for all the MSI irq lines instead of
>>>> only the first line. So you might have to do for MAX_MSI_IRQS lines.
>>
>> Maybe it should be only till MAX_MSI_IRQS-1?

I meant something like this,

	for (i = 0; i < MAX_MSI_IRQS; i++)
		irq_create_mapping(pp->irq_domain, i);

That didn't give me any issues though.

Thanks
Kishon
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