Re: [dpdk-stable] [PATCH 1/2] mempool/dpaa2: fix the return value for alloc fail

[Olivier Matz <olivier.matz@6wind.com>]

Hi Hemant,

On Tue, 23 May 2017 15:03:47 +0530, Hemant Agrawal <hemant.agrawal@nxp.com> wrote:
> In case the alloc api is not able to allocate the required
> number of buffer, it can return '0', which will not indicate
> the failure to the calling function.
> This patch fix the return value to indicate the failure.
> 
> Fixes: 5dc43d22b5ad ("mempool/dpaa2: add hardware offloaded mempool")
> CC: stable@dpdk.org
> 
> Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
> ---
>  drivers/mempool/dpaa2/dpaa2_hw_mempool.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mempool/dpaa2/dpaa2_hw_mempool.c b/drivers/mempool/dpaa2/dpaa2_hw_mempool.c
> index 5a5d6aa..60dd1c0 100644
> --- a/drivers/mempool/dpaa2/dpaa2_hw_mempool.c
> +++ b/drivers/mempool/dpaa2/dpaa2_hw_mempool.c
> @@ -294,7 +294,7 @@
>  			/* Releasing all buffers allocated */
>  			rte_dpaa2_mbuf_release(pool, obj_table, bpid,
>  					   bp_info->meta_data_size, n);
> -			return ret;
> +			return -1;
>  		}
>  		/* assigning mbuf from the acquired objects */
>  		for (i = 0; (i < ret) && bufs[i]; i++) {

Wouldn't it be better to return an errno as done in ring handler
(see common_ring_mp_enqueue()) or in stack handler (see stack_alloc())?

Olivier