linux-kernel - Re: [PATCH v2 1/3] IB/core: Removed port validity check from ib_get_cached_subnet

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Date:   Thu, 3 Jun 2021 11:54:45 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Anand Khoje <anand.a.khoje@...cle.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        dledford@...hat.com, jgg@...pe.ca, haakon.bugge@...cle.com
Subject: Re: [PATCH v2 1/3] IB/core: Removed port validity check from
 ib_get_cached_subnet_prefix

On Thu, Jun 03, 2021 at 12:20:22PM +0530, Anand Khoje wrote:
> Removed port validity check from ib_get_cached_subnet_prefix()
> as this check is not needed because "port_num" is valid.
> 
> Suggested-by: Leon Romanovsky <leon@...nel.org>
> Signed-off-by: Anand Khoje <anand.a.khoje@...cle.com>
> Signed-off-by: Haakon Bugge <haakon.bugge@...cle.com>
> ---
>  drivers/infiniband/core/cache.c     |  7 ++-----
>  drivers/infiniband/core/core_priv.h |  2 +-
>  drivers/infiniband/core/device.c    | 14 +++++---------
>  drivers/infiniband/core/security.c  |  7 ++-----
>  4 files changed, 10 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
> index 3b0991f..b6700ad 100644
> --- a/drivers/infiniband/core/cache.c
> +++ b/drivers/infiniband/core/cache.c
> @@ -1069,19 +1069,16 @@ int ib_get_cached_pkey(struct ib_device *device,
>  }
>  EXPORT_SYMBOL(ib_get_cached_pkey);
>  
> -int ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
> +void ib_get_cached_subnet_prefix(struct ib_device *device, u32 port_num,
>  				u64 *sn_pfx)
>  {
>  	unsigned long flags;
>  
> -	if (!rdma_is_port_valid(device, port_num))
> -		return -EINVAL;
> -
>  	read_lock_irqsave(&device->cache_lock, flags);
>  	*sn_pfx = device->port_data[port_num].cache.subnet_prefix;
>  	read_unlock_irqrestore(&device->cache_lock, flags);
>  
> -	return 0;
> +	return;

"return" is not needed here.

>  }
>  EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
>  
> diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
> index 29809dd..0b23f50 100644
> --- a/drivers/infiniband/core/core_priv.h
> +++ b/drivers/infiniband/core/core_priv.h
> @@ -214,7 +214,7 @@ int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
>  			     struct nlmsghdr *nlh,
>  			     struct netlink_ext_ack *extack);
>  
> -int ib_get_cached_subnet_prefix(struct ib_device *device,
> +void ib_get_cached_subnet_prefix(struct ib_device *device,
>  				u32 port_num,
>  				u64 *sn_pfx);
>  
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index c660cef..c2fa592 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -886,15 +886,11 @@ static void ib_policy_change_task(struct work_struct *work)
>  
>  		rdma_for_each_port (dev, i) {
>  			u64 sp;

Please add extra blank line after variable declaration or simply move it
outside of rdma_for_each_port() loop.

> -			int ret = ib_get_cached_subnet_prefix(dev,
> -							      i,
> -							      &sp);
> -
> -			WARN_ONCE(ret,
> -				  "ib_get_cached_subnet_prefix err: %d, this should never happen here\n",
> -				  ret);
> -			if (!ret)
> -				ib_security_cache_change(dev, i, sp);
> +			ib_get_cached_subnet_prefix(dev,
> +						    i,
> +						    &sp);

Strange line formatting, please use clang-formatter and don't break the line.

> +
> +			ib_security_cache_change(dev, i, sp);
>  		}
>  	}
>  	up_read(&devices_rwsem);
> diff --git a/drivers/infiniband/core/security.c b/drivers/infiniband/core/security.c
> index e5a78d1..5433912 100644
> --- a/drivers/infiniband/core/security.c
> +++ b/drivers/infiniband/core/security.c
> @@ -72,7 +72,7 @@ static int get_pkey_and_subnet_prefix(struct ib_port_pkey *pp,
>  	if (ret)
>  		return ret;
>  
> -	ret = ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
> +	ib_get_cached_subnet_prefix(dev, pp->port_num, subnet_prefix);
>  
>  	return ret;
>  }
> @@ -664,10 +664,7 @@ static int ib_security_pkey_access(struct ib_device *dev,
>  	if (ret)
>  		return ret;
>  
> -	ret = ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
> -
> -	if (ret)
> -		return ret;
> +	ib_get_cached_subnet_prefix(dev, port_num, &subnet_prefix);
>  
>  	return security_ib_pkey_access(sec, subnet_prefix, pkey);
>  }
> -- 
> 1.8.3.1
>