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

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Message-ID: <CAL2rwxpYLUWCVSZJNB0_BRh0DXRab9TRVnWsvpkph3GNCOfT7w@mail.gmail.com>
Date:   Mon, 3 Dec 2018 12:10:07 +0530
From:   Sumit Saxena <sumit.saxena@...adcom.com>
To:     thomas@...3r.de
Cc:     Kashyap Desai <kashyap.desai@...adcom.com>,
        Shivasharan Srikanteshwara 
        <shivasharan.srikanteshwara@...adcom.com>,
        "James E. J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        megaraidlinux.pdl@...adcom.com,
        Linux SCSI List <linux-scsi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: megaraid_sas: NULL check before some freeing
 functions is not needed.

On Mon, Dec 3, 2018 at 2:25 AM Thomas Meyer <thomas@...3r.de> wrote:
>
> NULL check before some freeing functions is not needed.
>
> Signed-off-by: Thomas Meyer <thomas@...3r.de>

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

> ---
>
> diff -u -p a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
> --- a/drivers/scsi/megaraid/megaraid_mbox.c
> +++ b/drivers/scsi/megaraid/megaraid_mbox.c
> @@ -1243,8 +1243,7 @@ megaraid_mbox_teardown_dma_pools(adapter
>                 dma_pool_free(raid_dev->sg_pool_handle, sg_pci_blk[i].vaddr,
>                         sg_pci_blk[i].dma_addr);
>         }
> -       if (raid_dev->sg_pool_handle)
> -               dma_pool_destroy(raid_dev->sg_pool_handle);
> +       dma_pool_destroy(raid_dev->sg_pool_handle);
>
>
>         epthru_pci_blk = raid_dev->epthru_pool;
> @@ -1252,8 +1251,7 @@ megaraid_mbox_teardown_dma_pools(adapter
>                 dma_pool_free(raid_dev->epthru_pool_handle,
>                         epthru_pci_blk[i].vaddr, epthru_pci_blk[i].dma_addr);
>         }
> -       if (raid_dev->epthru_pool_handle)
> -               dma_pool_destroy(raid_dev->epthru_pool_handle);
> +       dma_pool_destroy(raid_dev->epthru_pool_handle);
>
>
>         mbox_pci_blk = raid_dev->mbox_pool;
> @@ -1261,8 +1259,7 @@ megaraid_mbox_teardown_dma_pools(adapter
>                 dma_pool_free(raid_dev->mbox_pool_handle,
>                         mbox_pci_blk[i].vaddr, mbox_pci_blk[i].dma_addr);
>         }
> -       if (raid_dev->mbox_pool_handle)
> -               dma_pool_destroy(raid_dev->mbox_pool_handle);
> +       dma_pool_destroy(raid_dev->mbox_pool_handle);
>
>         return;
>  }
> diff -u -p a/drivers/scsi/megaraid/megaraid_mm.c b/drivers/scsi/megaraid/megaraid_mm.c
> --- a/drivers/scsi/megaraid/megaraid_mm.c
> +++ b/drivers/scsi/megaraid/megaraid_mm.c
> @@ -1017,8 +1017,7 @@ memalloc_error:
>         kfree(adapter->kioc_list);
>         kfree(adapter->mbox_list);
>
> -       if (adapter->pthru_dma_pool)
> -               dma_pool_destroy(adapter->pthru_dma_pool);
> +       dma_pool_destroy(adapter->pthru_dma_pool);
>
>         kfree(adapter);
>
> diff -u -p a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
> --- 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_
>
>         }
>
> -       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
>                         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
>                                   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);
>  }
>
>  /**
>
>