[PATCH 1/1] arm :omap :DMA: fix a bug on reserving the omap SDMA channels
R Sricharan
r.sricharan at ti.com
Thu Jan 3 02:28:11 EST 2013
Hi,
On Sunday 30 December 2012 02:13 AM, ahemaily at gmail.com wrote:
> From: ahemaily <ahemaily at gmail.com>
>
> The variable dma_lch_count used for comparison (omap_dma_reserve_channels <= dma_lch_count)
> before it initialized to the value from omap_dma_dev_attr : d->lch_count.
>
> I change the place of dma_lch_count initialization to be before the comparison.
>
> Signed-off-by: Abdelrahman Hemaily <ahemaily at gmail.com>
> ---
> arch/arm/plat-omap/dma.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
> index c76ed8b..cb3e321 100644
> --- a/arch/arm/plat-omap/dma.c
> +++ b/arch/arm/plat-omap/dma.c
> @@ -2014,12 +2014,12 @@ static int __devinit omap_system_dma_probe(struct platform_device *pdev)
>
> d = p->dma_attr;
> errata = p->errata;
> -
> + dma_lch_count = d->lch_count;
> +
> if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
> && (omap_dma_reserve_channels <= dma_lch_count))
> d->lch_count = omap_dma_reserve_channels;
>
> - dma_lch_count = d->lch_count;
By removing this line, you are effectively not assigning
d->lch_count after reserving. So the patch should only change
dma_lch_count in the above "if statement" to d->lch_count
Regards,
Sricharan
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