linux-kernel - Re: [PATCH 01/13] genirq/msi: Add cpumask allocation to alloc_msi

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Date:   Mon, 19 Sep 2016 09:30:58 +0200
From:   Alexander Gordeev <agordeev@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...com, tglx@...utronix.de, keith.busch@...el.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/13] genirq/msi: Add cpumask allocation to
 alloc_msi_entry

On Wed, Sep 14, 2016 at 04:18:47PM +0200, Christoph Hellwig wrote:
> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
> index 19e9dfb..8a3e8727 100644
> --- a/kernel/irq/msi.c
> +++ b/kernel/irq/msi.c
> @@ -18,20 +18,42 @@
>  /* Temparory solution for building, will be removed later */
>  #include <linux/pci.h>
>  
> -struct msi_desc *alloc_msi_entry(struct device *dev)
> +/**
> + * alloc_msi_entry - Allocate an initialize msi_entry
> + * @dev:	Pointer to the device for which this is allocated
> + * @nvec:	The number of vectors used in this entry
> + * @affinity:	Optional pointer to an affinity mask array size of @nvec
> + *
> + * If @affinity is not NULL then a an affinity array[@nvec] is allocated
> + * and the affinity masks from @affinity are copied.
> + */
> +struct msi_desc *
> +alloc_msi_entry(struct device *dev, int nvec, const struct cpumask *affinity)
>  {
> -	struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
> +	struct msi_desc *desc;
> +
> +	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
>  	if (!desc)
>  		return NULL;
>  
>  	INIT_LIST_HEAD(&desc->list);
>  	desc->dev = dev;
> +	desc->nvec_used = nvec;
> +	if (affinity) {
> +		desc->affinity = kmemdup(affinity,
> +			nvec * sizeof(*desc->affinity), GFP_KERNEL);
> +		if (!desc->affinity) {
> +			kfree(desc);
> +			return NULL;
> +		}
> +	}

nit - should not "desc" initialization follow "desc->affinity" allocation?

>  	return desc;
>  }
>  
>  void free_msi_entry(struct msi_desc *entry)
>  {
> +	kfree(entry->affinity);
>  	kfree(entry);
>  }
>  
> -- 
> 2.1.4
>