linux-kernel - Re: [PATCH] hv: vmbus_free_channels(): remove the redundant free

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Message-ID: <20150409090706.GA28274@kroah.com>
Date:	Thu, 9 Apr 2015 11:07:06 +0200
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org,
	driverdev-devel@...uxdriverproject.org, olaf@...fle.de,
	apw@...onical.com, jasowang@...hat.com, kys@...rosoft.com,
	vkuznets@...hat.com, dan.carpenter@...cle.com,
	haiyangz@...rosoft.com
Subject: Re: [PATCH] hv: vmbus_free_channels(): remove the redundant
 free_channel()

On Wed, Apr 08, 2015 at 11:13:47PM -0700, Dexuan Cui wrote:
> free_channel() has been invoked in
> vmbus_remove() -> hv_process_channel_removal(), or vmbus_remove() ->
> ... -> vmbus_close_internal() -> hv_process_channel_removal().
> 
> We also change to use list_for_each_entry_safe(), because the entry
> is removed in hv_process_channel_removal().
> 
> Thank Dan Carpenter for finding the issue!
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Cc: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  drivers/hv/channel_mgmt.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index 0eeb1b3..865a3af 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -212,11 +212,16 @@ void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
>  
>  void vmbus_free_channels(void)
>  {
> -	struct vmbus_channel *channel;
> +	struct vmbus_channel *channel, *tmp;
> +
> +	list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list,
> +		listentry) {

Horrid indentation, never put continuations on a 1 tab stop location,
you can't read this properly, right?

> +		/* if we don't set rescind to true, vmbus_close_internal()
> +		 * won't invoke hv_process_channel_removal().
> +		 */
> +		channel->rescind = true;

You are changing the logic here, right?  Why do you now need the _safe()
call if you aren't freeing anything?

confused,

greg k-h
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