From: Ira W. Snyder on
On Fri, Aug 13, 2010 at 11:32:11AM -0700, Ira W. Snyder wrote:
> The kfifo DMA sample driver is broken. It does not properly initialize
> the scatterlist, and therefore causes a kernel BUG with
> CONFIG_DEBUG_SG=y.
>
> Signed-off-by: Ira W. Snyder <iws(a)ovro.caltech.edu>
> ---

Whoops, forgot to CC Stefani Seibold.

> samples/kfifo/dma-example.c | 3 +++
> 1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/samples/kfifo/dma-example.c b/samples/kfifo/dma-example.c
> index b9482c2..baa5060 100644
> --- a/samples/kfifo/dma-example.c
> +++ b/samples/kfifo/dma-example.c
> @@ -45,6 +45,9 @@ static int __init example_init(void)
>
> printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo));
>
> + /* initialize scatterlist */
> + sg_init_table(sg, ARRAY_SIZE(sg));
> +
> ret = kfifo_dma_in_prepare(&fifo, sg, ARRAY_SIZE(sg), FIFO_SIZE);
> printk(KERN_INFO "DMA sgl entries: %d\n", ret);
>
> --
> 1.7.1
>
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