diff options
| author | Jan Beulich <jbeulich@novell.com> | 2008-08-05 13:01:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-05 14:33:49 -0700 |
| commit | d2dc1f4adb4b5b02d87e49e115e5107f4da790c0 (patch) | |
| tree | 37b5d2a3dd97a89981541b96bf6043741f09f92d /kernel/dma-coherent.c | |
| parent | 978cc90c469b38bcbbfd00a8c183d74e5b17bf45 (diff) | |
dma: fix order calculation in dma_mark_declared_memory_occupied()
get_order() takes byte-sized input, not a page-granular one.
Irrespective of this fix I'm inclined to believe that this doesn't work
right anyway - bitmap_allocate_region() has an implicit assumption of
'pos' being suitable for 'order', which this function doesn't seem to
enforce (and since it's being called with a byte-granular value there's no
reason to believe that the callers would make sure device_addr is passed
accordingly - it's also not documented that way).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/dma-coherent.c')
| -rw-r--r-- | kernel/dma-coherent.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c index 7517115a8cce..91e96950cd52 100644 --- a/kernel/dma-coherent.c +++ b/kernel/dma-coherent.c @@ -77,15 +77,14 @@ void *dma_mark_declared_memory_occupied(struct device *dev, { struct dma_coherent_mem *mem = dev->dma_mem; int pos, err; - int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1); - pages >>= PAGE_SHIFT; + size += device_addr & ~PAGE_MASK; if (!mem) return ERR_PTR(-EINVAL); pos = (device_addr - mem->device_base) >> PAGE_SHIFT; - err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages)); + err = bitmap_allocate_region(mem->bitmap, pos, get_order(size)); if (err != 0) return ERR_PTR(err); return mem->virt_base + (pos << PAGE_SHIFT); |