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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-06-30 11:41:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-30 18:56:00 -0700 |
| commit | c49568235dd7b4a2ffad63aa950562f4ffb9455f (patch) | |
| tree | fbfcc2e0ffc4a82bd9f481e1a746bfb49955800f | |
| parent | 4d6c13f87db12ae1ce35ea6a15688ac72419b133 (diff) | |
| download | blackbird-op-linux-c49568235dd7b4a2ffad63aa950562f4ffb9455f.tar.gz blackbird-op-linux-c49568235dd7b4a2ffad63aa950562f4ffb9455f.zip | |
dmapools: protect page_list walk in show_pools()
show_pools() walks the page_list of a pool w/o protection against the list
modifications in alloc/free. Take pool->lock to avoid stomping into
nirvana.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/dmapool.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/dmapool.c b/mm/dmapool.c index b1f0885dda22..3df063706f53 100644 --- a/mm/dmapool.c +++ b/mm/dmapool.c @@ -86,10 +86,12 @@ show_pools(struct device *dev, struct device_attribute *attr, char *buf) unsigned pages = 0; unsigned blocks = 0; + spin_lock_irq(&pool->lock); list_for_each_entry(page, &pool->page_list, page_list) { pages++; blocks += page->in_use; } + spin_unlock_irq(&pool->lock); /* per-pool info, no real statistics yet */ temp = scnprintf(next, size, "%-16s %4u %4Zu %4Zu %2u\n", |
