[PATCH v1 net-next] net: openvswitch: Use ERR_CAST() to return

[PATCH v1 net-next] net: openvswitch: Use ERR_CAST() to return

[Yan Zhen]

Using ERR_CAST() is more reasonable and safer, When it is necessary
to convert the type of an error pointer and return it.

Signed-off-by: Yan Zhen <yanzhen@vivo.com>
---
 net/openvswitch/flow_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index c92bdc4dfe19..729ef582a3a8 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -2491,7 +2491,7 @@ static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
 
 	acts = nla_alloc_flow_actions(new_acts_size);
 	if (IS_ERR(acts))
-		return (void *)acts;
+		return ERR_CAST(acts);
 
 	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
 	acts->actions_len = (*sfa)->actions_len;
-- 
2.34.1

Re: [PATCH v1 net-next] net: openvswitch: Use ERR_CAST() to return

[Eelco Chaudron]

On 29 Aug 2024, at 11:55, Yan Zhen wrote:

> Using ERR_CAST() is more reasonable and safer, When it is necessary
> to convert the type of an error pointer and return it.
>
> Signed-off-by: Yan Zhen <yanzhen@vivo.com>
> ---
>  net/openvswitch/flow_netlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index c92bdc4dfe19..729ef582a3a8 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -2491,7 +2491,7 @@ static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
>
>  	acts = nla_alloc_flow_actions(new_acts_size);
>  	if (IS_ERR(acts))
> -		return (void *)acts;
> +		return ERR_CAST(acts);

Change looks good to me.

Acked-by: Eelco Chaudron <echaudro@redhat.com>

>  	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
>  	acts->actions_len = (*sfa)->actions_len;
> -- 
> 2.34.1

Re: [ovs-dev] [PATCH v1 net-next] net: openvswitch: Use ERR_CAST() to return

[Aaron Conole]

Yan Zhen <yanzhen@vivo.com> writes:

> Using ERR_CAST() is more reasonable and safer, When it is necessary
> to convert the type of an error pointer and return it.
>
> Signed-off-by: Yan Zhen <yanzhen@vivo.com>
> ---

LGTM, and seems like the only remaining place where we are open coding
the error return conversion in the OVS module (at least, where we do a
check with IS_ERR).  At least, I tried to visit them all while looking
at this.

Reviewed-by: Aaron Conole <aconole@redhat.com>

>  net/openvswitch/flow_netlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
> index c92bdc4dfe19..729ef582a3a8 100644
> --- a/net/openvswitch/flow_netlink.c
> +++ b/net/openvswitch/flow_netlink.c
> @@ -2491,7 +2491,7 @@ static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa,
>
>  	acts = nla_alloc_flow_actions(new_acts_size);
>  	if (IS_ERR(acts))
> -		return (void *)acts;
> +		return ERR_CAST(acts);
>
>  	memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len);
>  	acts->actions_len = (*sfa)->actions_len;
> -- 
> 2.34.1

Re: [PATCH v1 net-next] net: openvswitch: Use ERR_CAST() to return

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Thu, 29 Aug 2024 17:55:09 +0800 you wrote:
> Using ERR_CAST() is more reasonable and safer, When it is necessary
> to convert the type of an error pointer and return it.
> 
> Signed-off-by: Yan Zhen <yanzhen@vivo.com>
> ---
>  net/openvswitch/flow_netlink.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Here is the summary with links:
  - [v1,net-next] net: openvswitch: Use ERR_CAST() to return
    https://git.kernel.org/netdev/net-next/c/b26b64493343

You are awesome, thank you!
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