linux-kernel - Re: [PATCH] scsi: qla2xxx: Use a variable for repeated mem

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Date:   Mon, 23 Jan 2023 18:41:54 +0000
From:   Himanshu Madhani <himanshu.madhani@...cle.com>
To:     Deepak R Varma <drv@...lo.com>
CC:     Nilesh Javali <njavali@...vell.com>,
        GR-QLogic-Storage-Upstream <GR-QLogic-Storage-Upstream@...vell.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Martin Petersen <martin.petersen@...cle.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Saurabh Singh Sengar <ssengar@...rosoft.com>,
        Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: Re: [PATCH] scsi: qla2xxx: Use a variable for repeated mem_size
 computation



> On Jan 8, 2023, at 12:38 PM, Deepak R Varma <drv@...lo.com> wrote:
> 
> Use a variable to upfront compute memory size to be allocated, instead of
> repeatedly computing the memory size at different instructions. The reduced
> instruction length also allows to tidy up the code. Issue identified using
> the array_size_dup Coccinelle semantic patch.
> 
> Signed-off-by: Deepak R Varma <drv@...lo.com>
> ---
> drivers/scsi/qla2xxx/tcm_qla2xxx.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
> index 8fa0056b56dd..8024322c9c5a 100644
> --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
> +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
> @@ -1552,6 +1552,7 @@ static const struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
> static int tcm_qla2xxx_init_lport(struct tcm_qla2xxx_lport *lport)
> {
> int rc;
> + size_t map_sz;
> 
> rc = btree_init32(&lport->lport_fcport_map);
> if (rc) {
> @@ -1559,17 +1560,15 @@ static int tcm_qla2xxx_init_lport(struct tcm_qla2xxx_lport *lport)
> return rc;
> }
> 
> - lport->lport_loopid_map =
> - vzalloc(array_size(65536,
> -   sizeof(struct tcm_qla2xxx_fc_loopid)));
> + map_sz = array_size(65536, sizeof(struct tcm_qla2xxx_fc_loopid));
> +
> + lport->lport_loopid_map = vzalloc(map_sz);
> if (!lport->lport_loopid_map) {
> - pr_err("Unable to allocate lport->lport_loopid_map of %zu bytes\n",
> -    sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
> + pr_err("Unable to allocate lport->lport_loopid_map of %zu bytes\n", map_sz);
> btree_destroy32(&lport->lport_fcport_map);
> return -ENOMEM;
> }
> - pr_debug("qla2xxx: Allocated lport_loopid_map of %zu bytes\n",
> -       sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
> + pr_debug("qla2xxx: Allocated lport_loopid_map of %zu bytes\n", map_sz);
> return 0;
> }
> 
> -- 
> 2.34.1
> 
> 
> 

Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com <mailto:himanshu.madhani@...cle.com>>

-- 
Himanshu Madhani Oracle Linux Engineering