Re: [PATCH] scsi: ibmvscsi_tgt: Mark expected switch fall-throughs

[Kees Cook]

On Mon, Jul 29, 2019 at 06:29:02AM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following warnings (Building: powerpc allyesconfig):
> 
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function 
> 'ibmvscsis_adapter_info':
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1582:6: warning: this statement may 
> fall through [-Wimplicit-fallthrough=]
>    if (connection_broken(vscsi))
>       ^
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1584:2: note: here
>   default:
>   ^~~~~~~
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function 
> 'ibmvscsis_ping_response':
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:2494:16: warning: this statement may 
> fall through [-Wimplicit-fallthrough=]
>    vscsi->flags |= CLIENT_FAILED;
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:2495:2: note: here
>   case H_DROPPED:
>   ^~~~
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:2496:16: warning: this statement may 
> fall through [-Wimplicit-fallthrough=]
>    vscsi->flags |= RESPONSE_Q_DOWN;
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:2497:2: note: here
>   case H_REMOTE_PARM:
>   ^~~~
> 
> Reported-by: Stephen Rothwell <s...@canb.auug.org.au>
> Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>

Reviewed-by: Kees Cook <keesc...@chromium.org>

-Kees

> ---
>  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c 
> b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> index 7f9535392a93..a929fe76102b 100644
> --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> @@ -1581,6 +1581,7 @@ static long ibmvscsis_adapter_info(struct scsi_info 
> *vscsi,
>       case H_PERMISSION:
>               if (connection_broken(vscsi))
>                       flag_bits = (RESPONSE_Q_DOWN | CLIENT_FAILED);
> +             /* Fall through */
>       default:
>               dev_err(&vscsi->dev, "adapter_info: h_copy_rdma to client 
> failed, rc %ld\n",
>                       rc);
> @@ -2492,8 +2493,10 @@ static long ibmvscsis_ping_response(struct scsi_info 
> *vscsi)
>               break;
>       case H_CLOSED:
>               vscsi->flags |= CLIENT_FAILED;
> +             /* Fall through */
>       case H_DROPPED:
>               vscsi->flags |= RESPONSE_Q_DOWN;
> +             /* Fall through */
>       case H_REMOTE_PARM:
>               dev_err(&vscsi->dev, "ping_response: h_send_crq failed, rc 
> %ld\n",
>                       rc);
> -- 
> 2.22.0
> 

-- 
Kees Cook