linux-kernel - Re: [PATCH] scsi: 3w-{sas,9xxx}: Use unsigned char for cdb

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Date:   Fri, 19 Oct 2018 13:59:45 -0700
From:   adam radford <aradford@...il.com>
To:     natechancellor@...il.com
Cc:     "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: 3w-{sas,9xxx}: Use unsigned char for cdb

On Thu, Oct 18, 2018 at 2:55 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> Clang warns a few times:
>
> drivers/scsi/3w-sas.c:386:11: warning: implicit conversion from 'int' to
> 'char' changes value from 128 to -128 [-Wconstant-conversion]
>         cdb[4] = TW_ALLOCATION_LENGTH; /* allocation length */
>                ~ ^~~~~~~~~~~~~~~~~~~~
>
> Update cdb's type to unsigned char, which matches the type of the cdb
> member in struct TW_Command_Apache.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/158
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/scsi/3w-9xxx.c | 12 ++++++++----
>  drivers/scsi/3w-sas.c  |  8 +++++---
>  2 files changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
> index 05293babb031..2d655a97b959 100644
> --- a/drivers/scsi/3w-9xxx.c
> +++ b/drivers/scsi/3w-9xxx.c
> @@ -143,7 +143,9 @@ static int twa_poll_status_gone(TW_Device_Extension *tw_dev, u32 flag, int secon
>  static int twa_post_command_packet(TW_Device_Extension *tw_dev, int request_id, char internal);
>  static int twa_reset_device_extension(TW_Device_Extension *tw_dev);
>  static int twa_reset_sequence(TW_Device_Extension *tw_dev, int soft_reset);
> -static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry *sglistarg);
> +static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
> +                                  unsigned char *cdb, int use_sg,
> +                                  TW_SG_Entry *sglistarg);
>  static void twa_scsiop_execute_scsi_complete(TW_Device_Extension *tw_dev, int request_id);
>  static char *twa_string_lookup(twa_message_type *table, unsigned int aen_code);
>
> @@ -278,7 +280,7 @@ static int twa_aen_complete(TW_Device_Extension *tw_dev, int request_id)
>  static int twa_aen_drain_queue(TW_Device_Extension *tw_dev, int no_check_reset)
>  {
>         int request_id = 0;
> -       char cdb[TW_MAX_CDB_LEN];
> +       unsigned char cdb[TW_MAX_CDB_LEN];
>         TW_SG_Entry sglist[1];
>         int finished = 0, count = 0;
>         TW_Command_Full *full_command_packet;
> @@ -423,7 +425,7 @@ static void twa_aen_queue_event(TW_Device_Extension *tw_dev, TW_Command_Apache_H
>  /* This function will read the aen queue from the isr */
>  static int twa_aen_read_queue(TW_Device_Extension *tw_dev, int request_id)
>  {
> -       char cdb[TW_MAX_CDB_LEN];
> +       unsigned char cdb[TW_MAX_CDB_LEN];
>         TW_SG_Entry sglist[1];
>         TW_Command_Full *full_command_packet;
>         int retval = 1;
> @@ -1798,7 +1800,9 @@ static int twa_scsi_queue_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_
>  static DEF_SCSI_QCMD(twa_scsi_queue)
>
>  /* This function hands scsi cdb's to the firmware */
> -static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry *sglistarg)
> +static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
> +                                  unsigned char *cdb, int use_sg,
> +                                  TW_SG_Entry *sglistarg)
>  {
>         TW_Command_Full *full_command_packet;
>         TW_Command_Apache *command_packet;
> diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
> index 266bdac75304..480cf82700e9 100644
> --- a/drivers/scsi/3w-sas.c
> +++ b/drivers/scsi/3w-sas.c
> @@ -287,7 +287,9 @@ static int twl_post_command_packet(TW_Device_Extension *tw_dev, int request_id)
>  } /* End twl_post_command_packet() */
>
>  /* This function hands scsi cdb's to the firmware */
> -static int twl_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id, char *cdb, int use_sg, TW_SG_Entry_ISO *sglistarg)
> +static int twl_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
> +                                  unsigned char *cdb, int use_sg,
> +                                  TW_SG_Entry_ISO *sglistarg)
>  {
>         TW_Command_Full *full_command_packet;
>         TW_Command_Apache *command_packet;
> @@ -372,7 +374,7 @@ static int twl_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
>  /* This function will read the aen queue from the isr */
>  static int twl_aen_read_queue(TW_Device_Extension *tw_dev, int request_id)
>  {
> -       char cdb[TW_MAX_CDB_LEN];
> +       unsigned char cdb[TW_MAX_CDB_LEN];
>         TW_SG_Entry_ISO sglist[1];
>         TW_Command_Full *full_command_packet;
>         int retval = 1;
> @@ -554,7 +556,7 @@ static int twl_poll_response(TW_Device_Extension *tw_dev, int request_id, int se
>  static int twl_aen_drain_queue(TW_Device_Extension *tw_dev, int no_check_reset)
>  {
>         int request_id = 0;
> -       char cdb[TW_MAX_CDB_LEN];
> +       unsigned char cdb[TW_MAX_CDB_LEN];
>         TW_SG_Entry_ISO sglist[1];
>         int finished = 0, count = 0;
>         TW_Command_Full *full_command_packet;
> --
> 2.19.1
>

Looks ok.

Signed-off-by: Adam Radford <aradford@...il.com>

-Adam