linux-kernel - Re: + ocfs2-remove-unneeded-rc-for-kfree.patch added to -mm tree

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Date:	Fri, 27 Feb 2015 15:06:37 +0800
From:	Joseph Qi <joseph.qi@...wei.com>
To:	<akpm@...ux-foundation.org>, <daeseok.youn@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <jlbec@...lplan.org>,
	<mfasheh@...e.com>, <mm-commits@...r.kernel.org>,
	"ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>
Subject: Re: + ocfs2-remove-unneeded-rc-for-kfree.patch added to -mm tree

We can only free conn->cc_private if error occurs. Otherwise it will
trigger a bug in o2cb_cluster_disconnect since conn->cc_private has
already been freed.
So please drop this patch, thanks.

On 2015/2/18 7:32, akpm@...ux-foundation.org wrote:
> 
> The patch titled
>      Subject: ocfs2: remove unneeded 'rc' for kfree()
> has been added to the -mm tree.  Its filename is
>      ocfs2-remove-unneeded-rc-for-kfree.patch
> 
> This patch should soon appear at
>     http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-remove-unneeded-rc-for-kfree.patch
> and later at
>     http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-remove-unneeded-rc-for-kfree.patch
> 
> Before you just go and hit "reply", please:
>    a) Consider who else should be cc'ed
>    b) Prefer to cc a suitable mailing list as well
>    c) Ideally: find the original patch on the mailing list and do a
>       reply-to-all to that, adding suitable additional cc's
> 
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> 
> The -mm tree is included into linux-next and is updated
> there every 3-4 working days
> 
> ------------------------------------------------------
> From: Daeseok Youn <daeseok.youn@...il.com>
> Subject: ocfs2: remove unneeded 'rc' for kfree()
> 
> If kzalloc() failed, just goto 'out' label and 'out_free' label doesn't
> need to check 'rc' variable.
> 
> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> Cc: Mark Fasheh <mfasheh@...e.com>
> Cc: Joel Becker <jlbec@...lplan.org>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  fs/ocfs2/stack_o2cb.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff -puN fs/ocfs2/stack_o2cb.c~ocfs2-remove-unneeded-rc-for-kfree fs/ocfs2/stack_o2cb.c
> --- a/fs/ocfs2/stack_o2cb.c~ocfs2-remove-unneeded-rc-for-kfree
> +++ a/fs/ocfs2/stack_o2cb.c
> @@ -347,7 +347,7 @@ static int o2cb_cluster_connect(struct o
>  	priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
>  	if (!priv) {
>  		rc = -ENOMEM;
> -		goto out_free;
> +		goto out;
>  	}
>  
>  	/* This just fills the structure in.  It is safe to pass conn. */
> @@ -376,8 +376,7 @@ static int o2cb_cluster_connect(struct o
>  	dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
>  
>  out_free:
> -	if (rc)
> -		kfree(conn->cc_private);
> +	kfree(conn->cc_private);
>  
>  out:
>  	return rc;
> _
> 
> Patches currently in -mm which might be from daeseok.youn@...il.com are
> 
> origin.patch
> ocfs2-remove-unneeded-rc-for-kfree.patch
> 
> --
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> 
> .
> 


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