[PATCH] scsi: iscsi_tcp: Explicitly cast param in iscsi_sw_tcp_host_get_param

[PATCH] scsi: iscsi_tcp: Explicitly cast param in iscsi_sw_tcp_host_get_param

[Nathan Chancellor]

Clang warns when one enumerated type is implicitly converted to another.

drivers/scsi/iscsi_tcp.c:803:15: warning: implicit conversion from
enumeration type 'enum iscsi_host_param' to different enumeration type
'enum iscsi_param' [-Wenum-conversion]
                                                 &addr, param, buf);
                                                        ^~~~~
1 warning generated.

iscsi_conn_get_addr_param handles ISCSI_HOST_PARAM_IPADDRESS just fine
so add an explicit cast to iscsi_param to make it clear to Clang that
this is expected behavior.

Link: https://github.com/ClangBuiltLinux/linux/issues/153
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/scsi/iscsi_tcp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index b025a0b74341..23354f206533 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -800,7 +800,8 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
 			return rc;
 
 		return iscsi_conn_get_addr_param((struct sockaddr_storage *)
-						 &addr, param, buf);
+						 &addr,
+						 (enum iscsi_param)param, buf);
 	default:
 		return iscsi_host_get_param(shost, param, buf);
 	}
-- 
2.19.0

Re: [PATCH] scsi: iscsi_tcp: Explicitly cast param in iscsi_sw_tcp_host_get_param

[Nick Desaulniers]

On Wed, Oct 3, 2018 at 6:06 PM Nathan Chancellor
<natechancellor@gmail.com> wrote:
>
> Clang warns when one enumerated type is implicitly converted to another.
>
> drivers/scsi/iscsi_tcp.c:803:15: warning: implicit conversion from
> enumeration type 'enum iscsi_host_param' to different enumeration type
> 'enum iscsi_param' [-Wenum-conversion]
>                                                  &addr, param, buf);
>                                                         ^~~~~
> 1 warning generated.
>
> iscsi_conn_get_addr_param handles ISCSI_HOST_PARAM_IPADDRESS just fine
> so add an explicit cast to iscsi_param to make it clear to Clang that
> this is expected behavior.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/153
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> ---
>  drivers/scsi/iscsi_tcp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
> index b025a0b74341..23354f206533 100644
> --- a/drivers/scsi/iscsi_tcp.c
> +++ b/drivers/scsi/iscsi_tcp.c
> @@ -800,7 +800,8 @@ static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
>                         return rc;
>
>                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
> -                                                &addr, param, buf);
> +                                                &addr,
> +                                                (enum iscsi_param)param, buf);

Alternatively, you could also just pass ISCSI_HOST_PARAM_IPADDRESS in
place of the cast (since in this case param ==
ISCSI_HOST_PARAM_IPADDRESS), but I don't feel strongly about this
(maybe the maintainers do).
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

>         default:
>                 return iscsi_host_get_param(shost, param, buf);
>         }
> --
> 2.19.0
>


-- 
Thanks,
~Nick Desaulniers