diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2017-01-02 12:07:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-19 20:18:03 +0100 |
| commit | 6c6ae8c43df99284b3260082b43b5858b701bd5e (patch) | |
| tree | 1ed30b38bdc5583aecafdb7ad611c56501cac286 /drivers/dma | |
| parent | 3fbaff3adc763d999fa803bc1aeb5e49c48ce5c0 (diff) | |
dmaengine: omap-dma: Fix dynamic lch_map allocation
commit 836c3ce2566fb8c1754f8d7c9534cad9bc8a6879 upstream.
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>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/omap-dma.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index 7ca27d4b1c54..6b16ce390dce 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -1339,6 +1339,7 @@ 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) @@ -1381,20 +1382,31 @@ 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; |