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

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Date:   Fri, 4 Jan 2019 20:41:36 +0530
From:   Sabyasachi Gupta <sabyasachi.linux@...il.com>
To:     John Garry <john.garry@...wei.com>
Cc:     jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        jthumshirn@...e.de, 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 Fri, Jan 4, 2019 at 6:43 PM John Garry <john.garry@...wei.com> wrote:
>
> 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?

I can't get it

>
> >>>> 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

I have not not checked with --strict option

>
> >>>>         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
> >>>>
> >
> > .
> >
>
>