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dmaengine: omap-dma: Fix dynamic lch_map allocation

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The original patch did not done what it was supposed to be doing and even
worst it broke legacy boot (OMAP1).

The lch_map size should be the number of available logical channels in sDMA
and the od->dma_requests should store the number of available DMA request
lines usable in sDMA.

In legacy mode we do not have a way to get the DMA request count, in that
case we use OMAP_SDMA_REQUESTS (127), despite the fact that OMAP1510 have
only 31 DMA request line.

Fixes: 2d1a9a946fae ("dmaengine: omap-dma: Dynamically allocate memory for lch_map")
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: stable@vger.kernel.org   # v4.9
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2017-01-02 12:07:37 +02:00 committed by Vinod Koul
parent 75bdc7f31a
commit 836c3ce256
1 changed files with 21 additions and 9 deletions
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30
drivers/dma/omap-dma.c
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@ -1452,6 +1452,7 @@ static int omap_dma_probe(struct platform_device *pdev)
struct omap_dmadev *od;
struct resource *res;
int rc, i, irq;
u32 lch_count;
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
if (!od)
@ -1494,20 +1495,31 @@ static int omap_dma_probe(struct platform_device *pdev)
spin_lock_init(&od->lock);
spin_lock_init(&od->irq_lock);
if (!pdev->dev.of_node) {
od->dma_requests = od->plat->dma_attr->lch_count;
if (unlikely(!od->dma_requests))
od->dma_requests = OMAP_SDMA_REQUESTS;
} else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
&od->dma_requests)) {
/* Number of DMA requests */
od->dma_requests = OMAP_SDMA_REQUESTS;
if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
"dma-requests",
&od->dma_requests)) {
dev_info(&pdev->dev,
"Missing dma-requests property, using %u.\n",
OMAP_SDMA_REQUESTS);
od->dma_requests = OMAP_SDMA_REQUESTS;
}
od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
sizeof(*od->lch_map), GFP_KERNEL);
/* Number of available logical channels */
if (!pdev->dev.of_node) {
lch_count = od->plat->dma_attr->lch_count;
if (unlikely(!lch_count))
lch_count = OMAP_SDMA_CHANNELS;
} else if (of_property_read_u32(pdev->dev.of_node, "dma-channels",
&lch_count)) {
dev_info(&pdev->dev,
"Missing dma-channels property, using %u.\n",
OMAP_SDMA_CHANNELS);
lch_count = OMAP_SDMA_CHANNELS;
}
od->lch_map = devm_kcalloc(&pdev->dev, lch_count, sizeof(*od->lch_map),
GFP_KERNEL);
if (!od->lch_map)
return -ENOMEM;