linux-kernel - Re: [PATCH] scsi: fix the build warning

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Date:	Thu, 22 Aug 2013 09:05:25 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	linux-scsi@...r.kernel.org,
	James Bottomley <jbottomley@...allels.com>,
	linux-kernel mlist <linux-kernel@...r.kernel.org>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [PATCH] scsi: fix the build warning

HI,

If you'd like, you should draft one patch for this warning.

On Thu, Aug 22, 2013 at 9:02 AM, Joe Perches <joe@...ches.com> wrote:
> On Thu, 2013-08-22 at 08:44 +0800, zwu.kernel@...il.com wrote:
>> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
>>
>>   Initialize csum variable to fix the build warning.
>
> Maybe it'd be better to change the variable
> scsi_debug_guard type to bool?
>
> Something like:
> ---
>  drivers/scsi/scsi_debug.c | 22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
> index cb4fefa..58375c3 100644
> --- a/drivers/scsi/scsi_debug.c
> +++ b/drivers/scsi/scsi_debug.c
> @@ -97,7 +97,7 @@ static const char * scsi_debug_version_date = "20100324";
>  #define DEF_D_SENSE   0
>  #define DEF_EVERY_NTH   0
>  #define DEF_FAKE_RW    0
> -#define DEF_GUARD 0
> +#define DEF_GUARD false
>  #define DEF_LBPU 0
>  #define DEF_LBPWS 0
>  #define DEF_LBPWS10 0
> @@ -169,7 +169,7 @@ static int scsi_debug_dix = DEF_DIX;
>  static int scsi_debug_dsense = DEF_D_SENSE;
>  static int scsi_debug_every_nth = DEF_EVERY_NTH;
>  static int scsi_debug_fake_rw = DEF_FAKE_RW;
> -static int scsi_debug_guard = DEF_GUARD;
> +static bool scsi_debug_guard = DEF_GUARD;
>  static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
>  static int scsi_debug_max_luns = DEF_MAX_LUNS;
>  static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
> @@ -1735,14 +1735,11 @@ static u16 dif_compute_csum(const void *buf, int len)
>  {
>         u16 csum;
>
> -       switch (scsi_debug_guard) {
> -       case 1:
> +       if (scsi_debug_guard)
>                 csum = ip_compute_csum(buf, len);
> -               break;
> -       case 0:
> +       else
>                 csum = cpu_to_be16(crc_t10dif(buf, len));
> -               break;
> -       }
> +
>         return csum;
>  }
>
> @@ -2736,7 +2733,7 @@ module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
>  module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
>  module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
>  module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
> -module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
> +module_param_named(guard, scsi_debug_guard, bool, S_IRUGO);
>  module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
>  module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
>  module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
> @@ -3312,11 +3309,6 @@ static int __init scsi_debug_init(void)
>                 return -EINVAL;
>         }
>
> -       if (scsi_debug_guard > 1) {
> -               printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
> -               return -EINVAL;
> -       }
> -
>         if (scsi_debug_ato > 1) {
>                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
>                 return -EINVAL;
> @@ -4028,7 +4020,7 @@ static int sdebug_driver_probe(struct device * dev)
>                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
>                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
>
> -       if (scsi_debug_guard == 1)
> +       if (scsi_debug_guard)
>                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
>         else
>                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
>
>



-- 
Regards,

Zhi Yong Wu
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