linux-kernel - Re: [PATCH][V2] scsi: qla2xxx: remove redundant null check on pointer sess

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Date:   Fri, 15 Feb 2019 22:38:59 +0000
From:   Himanshu Madhani <hmadhani@...vell.com>
To:     Colin King <colin.king@...onical.com>,
        "qla2xxx-upstream@...gic.com" <qla2xxx-upstream@...gic.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][V2] scsi: qla2xxx: remove redundant null check on pointer
 sess

Hi Colin,

On 2/15/19, 1:52 AM, "Colin King" <colin.king@...onical.com> wrote:

    External Email
    
    From: Colin Ian King <colin.king@...onical.com>
    
    The null check on pointer sess and the subsequent call is redundant
    as sess is null on all the the paths that lead to the out_term2 label.
    Hence the null check and the call can be removed.  Also remove the
    redundant setting of sess to NULL as this is not required now.
    
    Detected by CoverityScan, CID#1420663 ("Logically dead code")
    
    Signed-off-by: Colin Ian King <colin.king@...onical.com>
    ---
    
    V2: Remove the redundant settings of sess to NULL, thanks to
    Dan Carpenter for spotting this.
    
    ---
     drivers/scsi/qla2xxx/qla_target.c | 6 +-----
     1 file changed, 1 insertion(+), 5 deletions(-)
    
    diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
    index 6b8c655d9eb4..33131446b327 100644
    --- a/drivers/scsi/qla2xxx/qla_target.c
    +++ b/drivers/scsi/qla2xxx/qla_target.c
    @@ -6343,7 +6343,7 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
            struct atio_from_isp *a = &prm->tm_iocb2;
            struct scsi_qla_host *vha = tgt->vha;
            struct qla_hw_data *ha = vha->hw;
    -       struct fc_port *sess = NULL;
    +       struct fc_port *sess;
            unsigned long flags;
            uint8_t *s_id = NULL; /* to hide compiler warnings */
            int rc;
    @@ -6369,7 +6369,6 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
                            goto out_term2;
            } else {
                    if (sess->deleted) {
    -                       sess = NULL;
                            goto out_term2;
                    }
    
    @@ -6377,7 +6376,6 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
                            ql_dbg(ql_dbg_tgt_tmr, vha, 0xf020,
                                "%s: kref_get fail %8phC\n",
                                 __func__, sess->port_name);
    -                       sess = NULL;
                            goto out_term2;
                    }
            }
    @@ -6396,8 +6394,6 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
            return;
    
     out_term2:
    -       if (sess)
    -               ha->tgt.tgt_ops->put_sess(sess);
            spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
     out_term:
            qlt_send_term_exchange(ha->base_qpair, NULL, &prm->tm_iocb2, 1, 0);
    --
    2.20.1
    
Thanks for the Patch. Looks good

Acked-by: Himanshu Madhani <hmadhani@...vell.com>