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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Eric Dumazet <edumazet@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tcp: remove redundant check on tskb
Date: Thu, 4 Apr 2019 18:05:09 +0300	[thread overview]
Message-ID: <20190404150508.GL32590@kadam> (raw)
In-Reply-To: <20190404144603.27682-1-colin.king@canonical.com>

On Thu, Apr 04, 2019 at 03:46:03PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The non-null check on tskb is always false because it is in an else
> path of a check on tskb and hence tskb is null in this code block.
> This is check is therefore redundant and can be removed as well
> as the label coalesc.
> 
> if (tsbk) {
>         ...
> } else {
>         ...
>         if (unlikely(!skb)) {
>                 if (tskb)       /* can never be true, redundant code */
>                         goto coalesc;
>                 return;
>         }
> }
> 
> Addresses-Coverity: ("Logically dead code")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

This was fallout from commit 75c119afe14f ("tcp: implement rb-tree based
retransmit queue").

regards,
dan carpenter


WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Colin King <colin.king@canonical.com>
Cc: Eric Dumazet <edumazet@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	netdev@vger.kernel.org, kernel-janitors@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tcp: remove redundant check on tskb
Date: Thu, 04 Apr 2019 15:05:09 +0000	[thread overview]
Message-ID: <20190404150508.GL32590@kadam> (raw)
In-Reply-To: <20190404144603.27682-1-colin.king@canonical.com>

On Thu, Apr 04, 2019 at 03:46:03PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The non-null check on tskb is always false because it is in an else
> path of a check on tskb and hence tskb is null in this code block.
> This is check is therefore redundant and can be removed as well
> as the label coalesc.
> 
> if (tsbk) {
>         ...
> } else {
>         ...
>         if (unlikely(!skb)) {
>                 if (tskb)       /* can never be true, redundant code */
>                         goto coalesc;
>                 return;
>         }
> }
> 
> Addresses-Coverity: ("Logically dead code")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

This was fallout from commit 75c119afe14f ("tcp: implement rb-tree based
retransmit queue").

regards,
dan carpenter

  reply	other threads:[~2019-04-04 15:06 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-04 14:46 [PATCH] tcp: remove redundant check on tskb Colin King
2019-04-04 14:46 ` Colin King
2019-04-04 15:05 ` Dan Carpenter [this message]
2019-04-04 15:05   ` Dan Carpenter
2019-04-05  6:47 ` Mukesh Ojha
2019-04-05  6:59   ` Mukesh Ojha
2019-04-05  7:46 ` Eric Dumazet
2019-04-05  7:46   ` Eric Dumazet
2019-04-07  1:18 ` David Miller
2019-04-07  1:18   ` David Miller

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