linux-kernel - Re: [PATCH -next] RDMA/core: Properly return the error code of rdma_set_src_addr

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Date:   Wed, 19 Sep 2018 10:14:26 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     dledford@...hat.com, leon@...nel.org, parav@...lanox.com,
        danielj@...lanox.com, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH -next] RDMA/core: Properly return the error code of
 rdma_set_src_addr_rcu

On Wed, Sep 19, 2018 at 08:28:38PM +0800, YueHaibing wrote:
> rdma_set_src_addr_rcu should check copy_src_l2_addr fails,
> rather than always return 0. Also copy_src_l2_addr should return
> 'ret' as its return value while rdma_translate_ip fails.
> 
> Fixes: c31d4b2ddf07 ("RDMA/core: Protect against changing dst->dev during destination resolve")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> Reviewed-by: Parav Pandit <parav@...lanox.com>
> ---
>  drivers/infiniband/core/addr.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)

Applied to for-next, thanks

> diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
> index 7a0356c..8a31b11 100644
> --- a/drivers/infiniband/core/addr.c
> +++ b/drivers/infiniband/core/addr.c
> @@ -468,7 +468,7 @@ static int addr_resolve_neigh(const struct dst_entry *dst,
>  	return ret;
>  }
>  
> -static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
> +static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
>  			     const struct sockaddr *dst_in,
>  			     const struct dst_entry *dst,
>  			     const struct net_device *ndev)

I fixed the indenting as Parav pointed out

> @@ -492,6 +492,8 @@ static void copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
>  						RDMA_NETWORK_IPV6;
>  	else
>  		dev_addr->network = RDMA_NETWORK_IB;
> +
> +	return ret;
>  }
>  
>  static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
> @@ -499,6 +501,7 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>  				 const struct sockaddr *dst_in,
>  				 const struct dst_entry *dst)
>  {
> +	int ret;
>  	struct net_device *ndev = READ_ONCE(dst->dev);
>  
>  	*ndev_flags = ndev->flags;
> @@ -515,8 +518,8 @@ static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
>  			return -ENODEV;
>  	}
>  
> -	copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
> -	return 0;
> +	ret = copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
> +	return ret;
>  }

And made this just 'return copy_src_l2_addr' without the ret.

Jason