On Tue, 5 Mar 2013 10:58:22 -0500
Matt Porter <mporter@xxxxxx> wrote:
> This adds additional error checking to the private edma api implementation
> to catch the case where the edma_alloc_slot() has an invalid controller
> parameter. The edma dmaengine wrapper driver relies on this condition
> being handled in order to avoid setting up a second edma dmaengine
> instance on DA830.
>
> Verfied using a DA850 with the second EDMA controller platform instance
> removed to simulate a DA830 which only has a single EDMA controller.
>
> Reported-by: Tomas Novotny <tomas@xxxxxxxxxx>
> Signed-off-by: Matt Porter <mporter@xxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v3.7.x+
> ---
> v2: Move error check out of conditional to catch all cases
>
> arch/arm/mach-davinci/dma.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm/mach-davinci/dma.c b/arch/arm/mach-davinci/dma.c
> index a685e97..45b7c71 100644
> --- a/arch/arm/mach-davinci/dma.c
> +++ b/arch/arm/mach-davinci/dma.c
> @@ -743,6 +743,9 @@ EXPORT_SYMBOL(edma_free_channel);
> */
> int edma_alloc_slot(unsigned ctlr, int slot)
> {
> + if (!edma_cc[ctlr])
> + return -EINVAL;
> +
> if (slot >= 0)
> slot = EDMA_CHAN_SLOT(slot);
>
On the TI AM1707 based custom board:
Tested-by: Tomas Novotny <tomas@xxxxxxxxxx>
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