linux-kernel - [PATCH] dmapools: protect page_list walk in show

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Message-ID: <alpine.LFD.2.00.0906231634210.2767@localhost.localdomain>
Date:	Tue, 23 Jun 2009 16:41:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Matthew Wilcox <matthew@....cx>
cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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@...utronix.de>
---
diff --git a/mm/dmapool.c b/mm/dmapool.c
index b1f0885..3df0637 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",



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