From mboxrd@z Thu Jan  1 00:00:00 1970
From: wangyijing@huawei.com (Yijing Wang)
Date: Tue, 16 Sep 2014 09:30:40 +0800
Subject: [PATCH v1 03/21] MSI: Remove the redundant irq_set_chip_data()
In-Reply-To: <1410789648.3314.5.camel@pengutronix.de>
References: <1409911806-10519-1-git-send-email-wangyijing@huawei.com>	
 <1409911806-10519-4-git-send-email-wangyijing@huawei.com>
 <1410789648.3314.5.camel@pengutronix.de>
Message-ID: <541792C0.9090303@huawei.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 2014/9/15 22:00, Lucas Stach wrote:
> Am Freitag, den 05.09.2014, 18:09 +0800 schrieb Yijing Wang:
>> Currently, pcie-designware, pcie-rcar, pci-tegra drivers
>> use irq chip_data to save the msi_chip pointer. They
>> already call irq_set_chip_data() in their own MSI irq map
>> functions. So irq_set_chip_data() in arch_setup_msi_irq()
>> is useless.
>>
>> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
>> ---
>>  drivers/pci/msi.c |    2 --
>>  1 files changed, 0 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
>> index f6cb317..d547f7f 100644
>> --- a/drivers/pci/msi.c
>> +++ b/drivers/pci/msi.c
>> @@ -41,8 +41,6 @@ int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
>>  	if (err < 0)
>>  		return err;
>>  
>> -	irq_set_chip_data(desc->irq, chip);
>> -
>>  	return 0;
>>  }
>>  
> 
> arch_teardown_msi_irq() expects to find the msi_chip in the irq
> chip_data field. As this means drivers don't have any reasonable other
> possibility to stuff things into this field, I think it would make sense
> to do the cleanup the other way around: keep the irq_set_chip_data
> arch_setup_msi_irq() and rip it out of the individual drivers.

Hi Lucas, thanks for your review and comments!
irq_set_chip_data() should not be placed in MSI core functions, because other arch like x86,
use irq_data->chip_data to stores irq_cfg. So how to set the chip_data is arch dependent.
And this series is mainly to use MSI chip framework in all platforms.
Currently, only ARM platform MSI drivers use the chip_data to store msi_chip, and the drivers call
irq_set_chip_data() in their driver already. So I thought we should clean up it in MSI core code.

Thanks!
Yijing.


> 
> Regards,
> Lucas
> 


-- 
Thanks!
Yijing