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Cc:     linux-kernel@vger.kernel.org
Subject: Re: [PATCH] scsi: Remove unnecessary calls to memset after
 dma_alloc_coherent
From:   Markus Elfring <Markus.Elfring@web.de>
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To:     Alex Dewar <alex.dewar@gmx.co.uk>,
        Allison Randal <allison@lohutok.net>,
        Arnd Bergmann <arnd@arndb.de>,
        Chaitra Basappa <chaitra.basappa@broadcom.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Himanshu Madhani <hmadhani@marvell.com>,
        "James E. J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Richard Fontana <rfontana@redhat.com>,
        Sathya Prakash <sathya.prakash@broadcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@broadcom.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-scsi@vger.kernel.org, aacraid@microsemi.com,
        MPT-FusionLinux.pdl@broadcom.com
Message-ID: <e2401a31-e9fd-e849-e27c-6e079f5556d2@web.de>
Date:   Sat, 4 Apr 2020 13:14:52 +0200
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

> dma_alloc_coherent() now zeroes memory after allocation, so additional
> calls to memset() afterwards are unnecessary. Remove them.

I suggest to reconsider the distribution of recipients also for this patch
according to the fields =E2=80=9CCc=E2=80=9D and =E2=80=9CTo=E2=80=9D.


=E2=80=A6
> +++ b/drivers/scsi/dpt_i2o.c
=E2=80=A6
> @@ -3067,13 +3064,12 @@ static int adpt_i2o_build_sys_table(void)
>  	sys_tbl_len =3D sizeof(struct i2o_sys_tbl) +	// Header + IOPs
>  				(hba_count) * sizeof(struct i2o_sys_tbl_entry);
>
> -	sys_tbl =3D dma_alloc_coherent(&pHba->pDev->dev,
> -				sys_tbl_len, &sys_tbl_pa, GFP_KERNEL);
> +	sys_tbl =3D dma_alloc_coherent(&pHba->pDev->dev, sys_tbl_len,
> +				     &sys_tbl_pa, GFP_KERNEL);
>  	if (!sys_tbl) {
=E2=80=A6
> +++ b/drivers/scsi/mvsas/mv_init.c
> @@ -244,28 +244,22 @@ static int mvs_alloc(struct mvs_info *mvi, struct =
Scsi_Host *shost)
=E2=80=A6
> -	mvi->slot =3D dma_alloc_coherent(mvi->dev,
> -				       sizeof(*mvi->slot) * slot_nr,
> +	mvi->slot =3D dma_alloc_coherent(mvi->dev, sizeof(*mvi->slot) * slot_n=
r,
>  				       &mvi->slot_dma, GFP_KERNEL);
>  	if (!mvi->slot)
=E2=80=A6
> +++ b/drivers/scsi/qla2xxx/qla_isr.c
> @@ -79,7 +79,7 @@ qla24xx_process_abts(struct scsi_qla_host *vha, void *=
pkt)
>  	    (uint8_t *)abts, sizeof(*abts));
>
>  	rsp_els =3D dma_alloc_coherent(&ha->pdev->dev, sizeof(*rsp_els), &dma,
> -	    GFP_KERNEL);
> +				     GFP_KERNEL);
>  	if (!rsp_els) {
=E2=80=A6
> +++ b/drivers/scsi/qla2xxx/qla_mbx.c
> @@ -4887,15 +4887,13 @@ qla25xx_set_els_cmds_supported(scsi_qla_host_t *=
vha)
>  	    "Entered %s.\n", __func__);
>
>  	els_cmd_map =3D dma_alloc_coherent(&ha->pdev->dev, ELS_CMD_MAP_SIZE,
> -	    &els_cmd_map_dma, GFP_KERNEL);
> +					 &els_cmd_map_dma, GFP_KERNEL);
>  	if (!els_cmd_map) {
=E2=80=A6

I find it safer to integrate such source code reformattings by
another update step which will be separated from the proposed deletion
of unwanted function calls.

Regards,
Markus