linux-kernel - Re: [PATCH] aic7xxx: use kzalloc instead of kmalloc + memset

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Message-ID: <CAPWTe+KQ3+AFGOsET6FeNmmtx4A4aFLydvOuCSGyi0oh8fE5cQ@mail.gmail.com>
Date:	Tue, 12 Mar 2013 08:47:40 +0200
From:	Silviu Popescu <silviupopescu1990@...il.com>
To:	linux-scsi@...r.kernel.org
Cc:	hare@...e.de, JBottomley@...allels.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] aic7xxx: use kzalloc instead of kmalloc + memset

On Sun, Mar 10, 2013 at 2:26 PM, Silviu-Mihai Popescu
<silviupopescu1990@...il.com> wrote:
> This replaces a call to kmalloc() followed by memset() with just one
> call to kzalloc(). This was found using make coccicheck.
>
> Signed-off-by: Silviu-Mihai Popescu <silviupopescu1990@...il.com>
> ---
>  drivers/scsi/aic7xxx/aic7xxx_core.c |    9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c
> index 10172a3..7f34d25 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx_core.c
> +++ b/drivers/scsi/aic7xxx/aic7xxx_core.c
> @@ -4464,10 +4464,9 @@ ahc_softc_init(struct ahc_softc *ahc)
>         ahc->pause = ahc->unpause | PAUSE;
>         /* XXX The shared scb data stuff should be deprecated */
>         if (ahc->scb_data == NULL) {
> -               ahc->scb_data = kmalloc(sizeof(*ahc->scb_data), GFP_ATOMIC);
> +               ahc->scb_data = kzalloc(sizeof(*ahc->scb_data), GFP_ATOMIC);
>                 if (ahc->scb_data == NULL)
>                         return (ENOMEM);
> -               memset(ahc->scb_data, 0, sizeof(*ahc->scb_data));
>         }
>
>         return (0);
> @@ -4780,10 +4779,9 @@ ahc_init_scbdata(struct ahc_softc *ahc)
>         SLIST_INIT(&scb_data->sg_maps);
>
>         /* Allocate SCB resources */
> -       scb_data->scbarray = kmalloc(sizeof(struct scb) * AHC_SCB_MAX_ALLOC, GFP_ATOMIC);
> +       scb_data->scbarray = kzalloc(sizeof(struct scb) * AHC_SCB_MAX_ALLOC, GFP_ATOMIC);
>         if (scb_data->scbarray == NULL)
>                 return (ENOMEM);
> -       memset(scb_data->scbarray, 0, sizeof(struct scb) * AHC_SCB_MAX_ALLOC);
>
>         /* Determine the number of hardware SCBs and initialize them */
>
> @@ -7558,14 +7556,13 @@ ahc_handle_en_lun(struct ahc_softc *ahc, struct cam_sim *sim, union ccb *ccb)
>                                 return;
>                         }
>                 }
> -               lstate = kmalloc(sizeof(*lstate), GFP_ATOMIC);
> +               lstate = kzalloc(sizeof(*lstate), GFP_ATOMIC);
>                 if (lstate == NULL) {
>                         xpt_print_path(ccb->ccb_h.path);
>                         printk("Couldn't allocate lstate\n");
>                         ccb->ccb_h.status = CAM_RESRC_UNAVAIL;
>                         return;
>                 }
> -               memset(lstate, 0, sizeof(*lstate));
>                 status = xpt_create_path(&lstate->path, /*periph*/NULL,
>                                          xpt_path_path_id(ccb->ccb_h.path),
>                                          xpt_path_target_id(ccb->ccb_h.path),
> --
> 1.7.9.5
>

Hello,

Would anyone be so kind as to review this?

Thanks,
Silviu Popescu
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