linux-kernel - Re: [PATCH] scsi: megaraid_sas: NULL check before some freeing functions is not needed

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Date:   Mon, 3 Dec 2018 12:13:18 +0530
From:   Sumit Saxena <sumit.saxena@...adcom.com>
To:     wen.yang99@....com.cn
Cc:     Kashyap Desai <kashyap.desai@...adcom.com>,
        Shivasharan Srikanteshwara 
        <shivasharan.srikanteshwara@...adcom.com>,
        LKML <linux-kernel@...r.kernel.org>, zhong.weidong@....com.cn,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] scsi: megaraid_sas: NULL check before some freeing
 functions is not needed

On Wed, Nov 28, 2018 at 1:36 PM Wen Yang <wen.yang99@....com.cn> wrote:
>
> dma_pool_destroy(NULL) is safe, so removes NULL check before freeing
> the mem. This patch also fix the ifnullfree.cocci warnings.
>
> Signed-off-by: Wen Yang <wen.yang99@....com.cn>

Acked-by: Sumit Saxena <sumit.saxena@...adcom.com>

> CC: Julia Lawall <julia.lawall@...6.fr>
> CC: Kashyap Desai <kashyap.desai@...adcom.com>
> CC: Sumit Saxena <sumit.saxena@...adcom.com>
> CC: Shivasharan S <shivasharan.srikanteshwara@...adcom.com>
> CC: linux-kernel@...r.kernel.org
> ---
>  drivers/scsi/megaraid/megaraid_sas_fusion.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
> index f74b5ea24f0f..aa477f09a7a5 100644
> --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
> +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
> @@ -807,10 +807,8 @@ megasas_free_rdpq_fusion(struct megasas_instance *instance) {
>
>         }
>
> -       if (fusion->reply_frames_desc_pool)
> -               dma_pool_destroy(fusion->reply_frames_desc_pool);
> -       if (fusion->reply_frames_desc_pool_align)
> -               dma_pool_destroy(fusion->reply_frames_desc_pool_align);
> +       dma_pool_destroy(fusion->reply_frames_desc_pool);
> +       dma_pool_destroy(fusion->reply_frames_desc_pool_align);
>
>         if (fusion->rdpq_virt)
>                 dma_free_coherent(&instance->pdev->dev,
> @@ -830,8 +828,7 @@ megasas_free_reply_fusion(struct megasas_instance *instance) {
>                         fusion->reply_frames_desc[0],
>                         fusion->reply_frames_desc_phys[0]);
>
> -       if (fusion->reply_frames_desc_pool)
> -               dma_pool_destroy(fusion->reply_frames_desc_pool);
> +       dma_pool_destroy(fusion->reply_frames_desc_pool);
>
>  }
>
> @@ -1627,8 +1624,7 @@ static inline void megasas_free_ioc_init_cmd(struct megasas_instance *instance)
>                                   fusion->ioc_init_cmd->frame,
>                                   fusion->ioc_init_cmd->frame_phys_addr);
>
> -       if (fusion->ioc_init_cmd)
> -               kfree(fusion->ioc_init_cmd);
> +       kfree(fusion->ioc_init_cmd);
>  }
>
>  /**
> --
> 2.19.1
>