dma_lch_count is zero before 1st call of omap_system_dma_probe.
omap_dma_reserve_channels has value before 1st call of omap_system_dma_probe
when 1st call of omap_system_dma_probe
we need set dma_lch_count before use it for judging
or which will be failed for omap_dma_reserve_channels
additional info:
this patch is only for fixing bug, not touch the features.
so, not use d->lch_count instead of dma_lch_count for the statement:
&& (omap_dma_reserve_channels <= dma_lch_count))
at least, now, current fixing is equal to above.
in the future
maybe omap_dma_reserve_channels can be set by outside (such as from /proc)
dma_lch_count is a static global variable which has effect to all devices.
maybe the original author do not hope the newer is larger than the older
Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
---
arch/arm/plat-omap/dma.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 4136b20..b382eef 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -2018,6 +2018,9 @@ static int omap_system_dma_probe(struct platform_device *pdev)
d = p->dma_attr;
errata = p->errata;
+ if (!dma_lch_count)
+ 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;
--
1.7.10.4
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