Subject: Re: [PATCH v5 2/4] resource: Use list_head to link sibling resource

From: Baoquan He <[email-masked]>
Date: Wed, 13 Jun 2018 14:55:47 +0800

On 06/12/18 at 05:10pm, Julia Lawall wrote:
> This looks wrong.  After a list iterator, the index variable points to a
> dummy structure.
> 
> julia
> 
> url:    https://github.com/0day-ci/linux/commits/Baoquan-He/resource-Use-list_head-to-link-sibling-resource/20180612-113600
> :::::: branch date: 7 hours ago
> :::::: commit date: 7 hours ago
> 
> >> kernel/resource.c:265:17-20: ERROR: invalid reference to the index variable of the iterator on line 253
> 
> # https://github.com/0day-ci/linux/commit/e906f15906750a86913ba2b1f08bad99129d3dfc
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout e906f15906750a86913ba2b1f08bad99129d3dfc
> vim +265 kernel/resource.c
> 
> ^1da177e4 Linus Torvalds 2005-04-16  247
> 5eeec0ec9 Yinghai Lu     2009-12-22  248  static void __release_child_resources(struct resource *r)
> 5eeec0ec9 Yinghai Lu     2009-12-22  249  {
> e906f1590 Baoquan He     2018-06-12  250  	struct resource *tmp, *next;
> 5eeec0ec9 Yinghai Lu     2009-12-22  251  	resource_size_t size;
> 5eeec0ec9 Yinghai Lu     2009-12-22  252
> e906f1590 Baoquan He     2018-06-12 @253  	list_for_each_entry_safe(tmp, next, &r->child, sibling) {
> 5eeec0ec9 Yinghai Lu     2009-12-22  254  		tmp->parent = NULL;
> e906f1590 Baoquan He     2018-06-12  255  		INIT_LIST_HEAD(&tmp->sibling);

							list_del_init(&tmp->sibling);

Thanks, Julia. Here I should use list_del_init(&op->list) to
replace INIT_LIST_HEAD(&tmp->sibling). 

> 5eeec0ec9 Yinghai Lu     2009-12-22  256  		__release_child_resources(tmp);
> 5eeec0ec9 Yinghai Lu     2009-12-22  257
> 5eeec0ec9 Yinghai Lu     2009-12-22  258  		printk(KERN_DEBUG "release child resource %pR\n", tmp);
> 5eeec0ec9 Yinghai Lu     2009-12-22  259  		/* need to restore size, and keep flags */
> 5eeec0ec9 Yinghai Lu     2009-12-22  260  		size = resource_size(tmp);
> 5eeec0ec9 Yinghai Lu     2009-12-22  261  		tmp->start = 0;
> 5eeec0ec9 Yinghai Lu     2009-12-22  262  		tmp->end = size - 1;
> 5eeec0ec9 Yinghai Lu     2009-12-22  263  	}
> e906f1590 Baoquan He     2018-06-12  264
> e906f1590 Baoquan He     2018-06-12 @265  	INIT_LIST_HEAD(&tmp->child);
> 5eeec0ec9 Yinghai Lu     2009-12-22  266  }
> 5eeec0ec9 Yinghai Lu     2009-12-22  267
> 
> ---
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