linux-kernel - Re: [PATCH]iommu: make return value consistence

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Date:	Thu, 13 Dec 2012 10:10:50 -0700
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Wang YanQing <udknight@...il.com>
Cc:	joerg.roedel@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]iommu: make return value consistence

On Fri, 2012-12-14 at 00:55 +0800, Wang YanQing wrote:
> if we don't define CONFIG_IOMMU_API the
> dummy functions alway return -ENODEV
> or -EINVAL except three function, so convert
> them to the same behavior to make consistence

But if we do define CONFIG_IOMMU_API the actual functions return NULL
instead of ERR_PTR, so any conversion needs to include the actual
functions and update the callers as well.  Thanks,

Alex

> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>  include/linux/iommu.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index f4a49a6..16e84f6 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -210,7 +210,7 @@ static inline bool iommu_present(struct bus_type *bus)
>  
>  static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
>  {
> -	return NULL;
> +	return ERR_PTR(-ENODEV);
>  }
>  
>  static inline void iommu_domain_free(struct iommu_domain *domain)
> @@ -275,7 +275,7 @@ static inline struct iommu_group *iommu_group_alloc(void)
>  
>  static inline void *iommu_group_get_iommudata(struct iommu_group *group)
>  {
> -	return NULL;
> +	return ERR_PTR(-EINVAL);
>  }
>  
>  static inline void iommu_group_set_iommudata(struct iommu_group *group,
> @@ -309,7 +309,7 @@ static inline int iommu_group_for_each_dev(struct iommu_group *group,
>  
>  static inline struct iommu_group *iommu_group_get(struct device *dev)
>  {
> -	return NULL;
> +	return ERR_PTR(-ENODEV);
>  }
>  
>  static inline void iommu_group_put(struct iommu_group *group)



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