linux-kernel - Re: [PATCH][next] net: ipa: remove the redundant assignment to variable trans

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Message-ID: <51e73530-7c65-4e2f-9749-7dbbe9098fde@ieee.org>
Date: Tue, 16 Jan 2024 05:44:48 -0600
From: Alex Elder <elder@...e.org>
To: Colin Ian King <colin.i.king@...il.com>, Alex Elder <elder@...nel.org>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net: ipa: remove the redundant assignment to
 variable trans_id

On 1/16/24 5:40 AM, Colin Ian King wrote:
> The variable trans_id is being modulo'd by channel->tre_count and
> the value is being re-assigned back to trans_id even though the
> variable is not used after this operation. The assignment is
> redundant. Remove the assignment and just replace it with the modulo
> operator.
> 
> Cleans up clang scan build warning:
> warning: Although the value stored to 'trans_id' is used in the
> enclosing expression, the value is never actually read from
> 'trans_id' [deadcode.DeadStores]
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

This looks good.  I saw this before but hadn't gotten around to
fixing it yet.  Thank you!

Reviewed-by: Alex Elder <elder@...aro.org>

> ---
>   drivers/net/ipa/gsi_trans.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
> index ee6fb00b71eb..f5dafc2f53ab 100644
> --- a/drivers/net/ipa/gsi_trans.c
> +++ b/drivers/net/ipa/gsi_trans.c
> @@ -247,7 +247,7 @@ struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel)
>   			return NULL;
>   	}
>   
> -	return &trans_info->trans[trans_id %= channel->tre_count];
> +	return &trans_info->trans[trans_id % channel->tre_count];
>   }
>   
>   /* Move a transaction from allocated to committed state */