linux-kernel - Re: [PATCH] scsi: target: vhost-scsi: remove redundant initialization of variable ret

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Message-ID: <YEEVypxRJloK/CRk@stefanha-x1.localdomain>
Date:   Thu, 4 Mar 2021 17:15:54 +0000
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: target: vhost-scsi: remove redundant
 initialization of variable ret

On Wed, Mar 03, 2021 at 01:43:39PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The variable ret is being initialized with a value that is never read
> and it is being updated later with a new value.  The initialization is
> redundant and can be removed.
> 
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/vhost/scsi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Which kernel version is this patch based on?

If it's a fix for a patch that hasn't landed yet, please indicate this.
A "Fixes: ..." tag should be added to this patch as well.

I looked at linux.git/master commit f69d02e37a85645aa90d18cacfff36dba370f797 and see this:

  static int __init vhost_scsi_init(void)
  {
          int ret = -ENOMEM;

          pr_debug("TCM_VHOST fabric module %s on %s/%s"
                  " on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
                  utsname()->machine);

          /*
           * Use our own dedicated workqueue for submitting I/O into
           * target core to avoid contention within system_wq.
           */
          vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
          if (!vhost_scsi_workqueue)
                  goto out;

We need ret's initialization value here ^

          ret = vhost_scsi_register();
          if (ret < 0)
                  goto out_destroy_workqueue;

          ret = target_register_template(&vhost_scsi_ops);
          if (ret < 0)
                  goto out_vhost_scsi_deregister;

          return 0;

  out_vhost_scsi_deregister:
          vhost_scsi_deregister();
  out_destroy_workqueue:
          destroy_workqueue(vhost_scsi_workqueue);
  out:
          return ret;
  };


> 
> diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
> index d16c04dcc144..9129ab8187fd 100644
> --- a/drivers/vhost/scsi.c
> +++ b/drivers/vhost/scsi.c
> @@ -2465,7 +2465,7 @@ static const struct target_core_fabric_ops vhost_scsi_ops = {
>  
>  static int __init vhost_scsi_init(void)
>  {
> -	int ret = -ENOMEM;
> +	int ret;
>  
>  	pr_debug("TCM_VHOST fabric module %s on %s/%s"
>  		" on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
> -- 
> 2.30.0
> 

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