linux-kernel - Re: [PATCH] platform-msi: Do not cache msi_desc in handler

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Date:	Mon, 14 Sep 2015 10:25:16 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Ma Jun <majun258@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform-msi: Do not cache msi_desc in handler_data

On 2015/9/13 20:37, Marc Zyngier wrote:
> The current implementation of platform MSI caches the msi_desc
> pointer in irq_data::handler_data. This is a bit silly, as
> we also have irq_data::msi_desc, which is perfectly valid.
> 
> Remove the useless assignment and simplify the whole flow.
> 
> Reported-by: Ma Jun <majun258@...wei.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Jiang Liu <jiang.liu@...ux.intel.com>



> ---
>  drivers/base/platform-msi.c | 18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
> index 1857a5d..134483d 100644
> --- a/drivers/base/platform-msi.c
> +++ b/drivers/base/platform-msi.c
> @@ -63,20 +63,8 @@ static int platform_msi_init(struct irq_domain *domain,
>  			     unsigned int virq, irq_hw_number_t hwirq,
>  			     msi_alloc_info_t *arg)
>  {
> -	struct irq_data *data;
> -
> -	irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
> -				      info->chip, info->chip_data);
> -
> -	/*
> -	 * Save the MSI descriptor in handler_data so that the
> -	 * irq_write_msi_msg callback can retrieve it (and the
> -	 * associated device).
> -	 */
> -	data = irq_domain_get_irq_data(domain, virq);
> -	data->handler_data = arg->desc;
> -
> -	return 0;
> +	return irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
> +					     info->chip, info->chip_data);
>  }
>  #else
>  #define platform_msi_set_desc		NULL
> @@ -97,7 +85,7 @@ static void platform_msi_update_dom_ops(struct msi_domain_info *info)
>  
>  static void platform_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
>  {
> -	struct msi_desc *desc = irq_data_get_irq_handler_data(data);
> +	struct msi_desc *desc = irq_data_get_msi_desc(data);
>  	struct platform_msi_priv_data *priv_data;
>  
>  	priv_data = desc->platform.msi_priv_data;
> 
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