提交 b247e8aa 编写于 作者: G Guennadi Liakhovetski 提交者: Linus Torvalds

dma_declare_coherent_memory wrong allocation

dma_declare_coherent_memory() allocates a bitmap 1 bit per page, it
calculates the bitmap size based on size of long, but allocates bytes...
Thanks to James Bottomley for clarifications and corrections.
Signed-off-by: NG. Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: NJames Bottomley <James.Bottomley@SteelEye.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 f19b121e
...@@ -76,7 +76,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, ...@@ -76,7 +76,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
{ {
void __iomem *mem_base; void __iomem *mem_base;
int pages = size >> PAGE_SHIFT; int pages = size >> PAGE_SHIFT;
int bitmap_size = (pages + 31)/32; int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
goto out; goto out;
......
...@@ -77,7 +77,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, ...@@ -77,7 +77,7 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
{ {
void __iomem *mem_base = NULL; void __iomem *mem_base = NULL;
int pages = size >> PAGE_SHIFT; int pages = size >> PAGE_SHIFT;
int bitmap_size = (pages + 31)/32; int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
goto out; goto out;
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册