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kernel/resource.c: handle reinsertion of an already-inserted resource 

If the same resource is inserted to the resource tree (maybe not on
purpose), a dead loop will be created.  In this situation, The kernel does
not report any warning or error :(

  The command below will show a endless print.
  #cat /proc/iomem

[akpm@linux-foundation.org: add WARN_ON()]
Signed-off-by: Huang Shijie <shijie8@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Huang Shijie 2010-10-27 15:34:52 -07:00 committed by Linus Torvalds
parent 144ecf310e
commit 5de1cb2d0f
1 changed files with 2 additions and 0 deletions
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kernel/resource.c
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@ -453,6 +453,8 @@ static struct resource * __insert_resource(struct resource *parent, struct resou
if (first == parent)
return first;
if (WARN_ON(first == new)) /* duplicated insertion */
return first;
if ((first->start > new->start) || (first->end < new->end))
break;