linux-kernel - Re: [PATCH] scsi/mvsas/mv_init.c: Use dma_zalloc

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Date:   Fri, 4 Jan 2019 13:13:08 +0000
From:   John Garry <john.garry@...wei.com>
To:     Sabyasachi Gupta <sabyasachi.linux@...il.com>,
        <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>,
        <jthumshirn@...e.de>
CC:     Souptick Joarder <jrdr.linux@...il.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Brajeswar Ghosh <brajeswar.linux@...il.com>
Subject: Re: [PATCH] scsi/mvsas/mv_init.c: Use dma_zalloc_coherent

On 04/01/2019 12:48, Sabyasachi Gupta wrote:
> On Wed, Dec 19, 2018 at 6:49 PM Sabyasachi Gupta
> <sabyasachi.linux@...il.com> wrote:
>>
>> On Sat, Dec 1, 2018 at 6:40 PM Sabyasachi Gupta
>> <sabyasachi.linux@...il.com> wrote:
>>>
>>> On Wed, Nov 21, 2018 at 7:18 PM Sabyasachi Gupta
>>> <sabyasachi.linux@...il.com> wrote:
>>>>
>>>> Replace dma_alloc_coherent + memset with dma_zalloc_coherent
>>>>

If you're going to make this change, then how about change these to the 
managed version, so that we can avoid the explicit free'ing at driver 
removal?

>>>> Signed-off-by: Sabyasachi Gupta <sabyasachi.linux@...il.com>
>>>
>>> Any comment on this patch?
>>
>> Any comment on this patch?
>
> Any comment on this patch?
>
>>
>>>
>>>> ---
>>>>  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 3ac3437..495bddb 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);

I'm guessing that this does not pass checkpatch with --strict option.

Thanks,
John

>>>>         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,
>>>> --
>>>> 2.7.4
>>>>
>
> .
>