linux-kernel - Re: [PATCH v3] scsi: sli4: Remove code duplication

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Date:   Thu, 17 Aug 2023 10:24:08 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     coolrrsh@...il.com, james.smart@...adcom.com,
        ram.vegesna@...adcom.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v3] scsi: sli4: Remove code duplication



On 8/17/23 04:43, coolrrsh@...il.com wrote:
> From: Rajeshwar R Shinde <coolrrsh@...il.com>
> 
> In the function sli_xmit_bls_rsp64_wqe, the 'if' and 'else' conditions
> evaluates the same expression and gives same output. Also, params->s_id
> shall not be equal to U32_MAX. Therefore removing the unused code.
> 
> This fixes coccinelle warning such as:

Thanks for that. ^^^^^

> drivers/scsi/elx/libefc_sli/sli4.c:2320:2-4: WARNING: possible
> condition with no effect (if == else)
> 
> Signed-off-by: Rajeshwar R Shinde <coolrrsh@...il.com>

Based on feedback from Broadcom people,
Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
> v1->v2
> Modified patch and the corrected the warnings using checkpatch.
> v2->v3
> Modified patch details keeping HW descriptor variable.
> 
> ---
>  drivers/scsi/elx/libefc_sli/sli4.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/scsi/elx/libefc_sli/sli4.c b/drivers/scsi/elx/libefc_sli/sli4.c
> index 8f96049f62dd..5e7fb110bc3f 100644
> --- a/drivers/scsi/elx/libefc_sli/sli4.c
> +++ b/drivers/scsi/elx/libefc_sli/sli4.c
> @@ -2317,12 +2317,8 @@ sli_xmit_bls_rsp64_wqe(struct sli4 *sli, void *buf,
>  		SLI4_GENERIC_CONTEXT_VPI << SLI4_BLS_RSP_WQE_CT_SHFT;
>  		bls->context_tag = cpu_to_le16(params->vpi);
>  
> -		if (params->s_id != U32_MAX)
> -			bls->local_n_port_id_dword |=
> -				cpu_to_le32(params->s_id & 0x00ffffff);
> -		else
> -			bls->local_n_port_id_dword |=
> -				cpu_to_le32(params->s_id & 0x00ffffff);
> +		bls->local_n_port_id_dword |=
> +			cpu_to_le32(params->s_id & 0x00ffffff);
>  
>  		dw_ridflags = (dw_ridflags & ~SLI4_BLS_RSP_RID) |
>  			       (params->d_id & SLI4_BLS_RSP_RID);

-- 
~Randy