linux-kernel - Re: [PATCH 4/4] drivers/scsi/mvsas/mv_init: Use dma_zalloc_coherent to replace dma_alloc

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Date:   Wed, 1 Aug 2018 18:34:26 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     zhong jiang <zhongjiang@...wei.com>
Cc:     John Garry <john.garry@...wei.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        aacraid@...rosemi.com, linux-scsi <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] drivers/scsi/mvsas/mv_init: Use dma_zalloc_coherent
 to replace dma_alloc_coherent+memset

On Wed, Aug 1, 2018 at 4:26 PM, zhong jiang <zhongjiang@...wei.com> wrote:
> The dma_zalloc_coherent is better than dma_alloc_coherent+memset,
> so replace them.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>


> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
> ---
>  drivers/scsi/mvsas/mv_init.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/scsi/mvsas/mv_init.c b/drivers/scsi/mvsas/mv_init.c
> index 8c91637..da62e18 100644
> --- a/drivers/scsi/mvsas/mv_init.c
> +++ b/drivers/scsi/mvsas/mv_init.c
> @@ -253,33 +253,29 @@ static int mvs_alloc(struct mvs_info *mvi, struct Scsi_Host *shost)
>         /*
>          * alloc and init our DMA areas
>          */
> -       mvi->tx = dma_alloc_coherent(mvi->dev,
> +       mvi->tx = dma_zalloc_coherent(mvi->dev,
>                                      sizeof(*mvi->tx) * MVS_CHIP_SLOT_SZ,
>                                      &mvi->tx_dma, GFP_KERNEL);
>         if (!mvi->tx)
>                 goto err_out;
> -       memset(mvi->tx, 0, sizeof(*mvi->tx) * MVS_CHIP_SLOT_SZ);
> -       mvi->rx_fis = dma_alloc_coherent(mvi->dev, MVS_RX_FISL_SZ,
> +       mvi->rx_fis = dma_zalloc_coherent(mvi->dev, MVS_RX_FISL_SZ,
>                                          &mvi->rx_fis_dma, GFP_KERNEL);
>         if (!mvi->rx_fis)
>                 goto err_out;
> -       memset(mvi->rx_fis, 0, MVS_RX_FISL_SZ);
>
> -       mvi->rx = dma_alloc_coherent(mvi->dev,
> +       mvi->rx = dma_zalloc_coherent(mvi->dev,
>                                      sizeof(*mvi->rx) * (MVS_RX_RING_SZ + 1),
>                                      &mvi->rx_dma, GFP_KERNEL);
>         if (!mvi->rx)
>                 goto err_out;
> -       memset(mvi->rx, 0, sizeof(*mvi->rx) * (MVS_RX_RING_SZ + 1));
>         mvi->rx[0] = cpu_to_le32(0xfff);
>         mvi->rx_cons = 0xfff;
>
> -       mvi->slot = dma_alloc_coherent(mvi->dev,
> +       mvi->slot = dma_zalloc_coherent(mvi->dev,
>                                        sizeof(*mvi->slot) * slot_nr,
>                                        &mvi->slot_dma, GFP_KERNEL);
>         if (!mvi->slot)
>                 goto err_out;
> -       memset(mvi->slot, 0, sizeof(*mvi->slot) * slot_nr);
>
>         mvi->bulk_buffer = dma_alloc_coherent(mvi->dev,
>                                        TRASH_BUCKET_SIZE,
> --
> 1.7.12.4
>



-- 
With Best Regards,
Andy Shevchenko