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SLUB: do proper locking during dma slab creation 

We modify the kmalloc_cache_dma[] array without proper locking.  Do the proper
locking and undo the dma cache creation if another processor has already
created it.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-07-17 04:03:25 -07:00 committed by Linus Torvalds
parent 2e443fd003
commit dfce8648d6
1 changed files with 9 additions and 2 deletions
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11
mm/slub.c
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@ -2301,8 +2301,15 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags)
text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d",
(unsigned int)realsize);
s = create_kmalloc_cache(x, text, realsize, flags);
kmalloc_caches_dma[index] = s;
return s;
down_write(&slub_lock);
if (!kmalloc_caches_dma[index]) {
kmalloc_caches_dma[index] = s;
up_write(&slub_lock);
return s;
}
up_write(&slub_lock);
kmem_cache_destroy(s);
return kmalloc_caches_dma[index];
}
#endif