linux-kernel - Re: [PATCH rdma-next 1/3] RDMA/core: Modify rdma_query

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Date:   Tue, 7 Dec 2021 14:41:57 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Avihai Horon <avihaih@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Mark Zhang <markzhang@...dia.com>
Subject: Re: [PATCH rdma-next 1/3] RDMA/core: Modify rdma_query_gid() to
 return accurate error codes

On Mon, Nov 22, 2021 at 01:53:56PM +0200, Leon Romanovsky wrote:
> From: Avihai Horon <avihaih@...dia.com>
> 
> Modify rdma_query_gid() to return -ENOENT for empty entries. This will
> make error reporting more accurate and will be used in next patches.
> 
> Signed-off-by: Avihai Horon <avihaih@...dia.com>
> Reviewed-by: Mark Zhang <markzhang@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>  drivers/infiniband/core/cache.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
> index 0c98dd3dee67..dd66f1a6e792 100644
> +++ b/drivers/infiniband/core/cache.c
> @@ -963,9 +963,13 @@ int rdma_query_gid(struct ib_device *device, u32 port_num,
>  	table = rdma_gid_table(device, port_num);
>  	read_lock_irqsave(&table->rwlock, flags);
>  
> -	if (index < 0 || index >= table->sz ||
> -	    !is_gid_entry_valid(table->data_vec[index]))
> +	if (index < 0 || index >= table->sz)
> +		goto done;
> +
> +	if (!is_gid_entry_valid(table->data_vec[index])) {
> +		res = -ENOENT;
>  		goto done;
> +	}

Please get rid of the default assignment to res so this code is all
consistent

@@ -955,7 +955,7 @@ int rdma_query_gid(struct ib_device *device, u32 port_num,
 {
        struct ib_gid_table *table;
        unsigned long flags;
-       int res = -EINVAL;
+       int res;
 
        if (!rdma_is_port_valid(device, port_num))
                return -EINVAL;
@@ -963,9 +963,15 @@ int rdma_query_gid(struct ib_device *device, u32 port_num,
        table = rdma_gid_table(device, port_num);
        read_lock_irqsave(&table->rwlock, flags);
 
-       if (index < 0 || index >= table->sz ||
-           !is_gid_entry_valid(table->data_vec[index]))
+       if (index < 0 || index >= table->sz) {
+               res = -EINVAL;
                goto done;
+       }
+
+       if (!is_gid_entry_valid(table->data_vec[index])) {
+               res = -ENOENT;
+               goto done;
+       }

Jason