From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kishon Vijay Abraham I <kishon@ti.com>
Subject: Re: [PATCH] PCI: designware: Add irq_create_mapping()
Date: Wed, 9 Oct 2013 14:35:50 +0530
Message-ID: <52551C6E.1040404@ti.com>
References: <000401cec4c6$dc415180$94c3f480$%han@samsung.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <000401cec4c6$dc415180$94c3f480$%han@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
To: Jingoo Han <jg1.han@samsung.com>
Cc: 'Bjorn Helgaas' <bhelgaas@google.com>, linux-pci@vger.kernel.org, linux-samsung-soc@vger.kernel.org, 'Kukjin Kim' <kgene.kim@samsung.com>, 'Pratyush Anand' <pratyush.anand@st.com>, 'Mohit KUMAR' <Mohit.KUMAR@st.com>, 'Siva Reddy Kallam' <siva.kallam@samsung.com>, 'SRIKANTH TUMKUR SHIVANAND' <ts.srikanth@samsung.com>, 'Arnd Bergmann' <arnd@arndb.de>, 'Sean Cross' <xobs@kosagi.com>, 'Thierry Reding' <thierry.reding@gmail.com>, 'Thomas Petazzoni' <thomas.petazzoni@free-electrons.com>, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
List-Id: devicetree@vger.kernel.org

Hi Jingoo,

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@samsung.com>
> Cc: Kishon Vijay Abraham I <kishon@ti.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.

Thanks
Kishon