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dmaengine: tegra210-adma: fix of_irq_get() error check

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of_irq_get() may return 0 as well as negative error number on failure,
while the driver only checks for the negative values. The driver would then
call request_irq(0, ...) in tegra_adma_alloc_chan_resources() and never get
valid channel interrupt.

Check for 'tdc->irq <= 0' instead and return -ENXIO from the driver's probe
iff of_irq_get() returned 0.

Fixes: f46b195799b5 ("dmaengine: tegra-adma: Add support for Tegra210 ADMA")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Sergei Shtylyov 2017-07-30 21:10:44 +03:00 committed by Vinod Koul
parent 5771a8c088
commit 7f5770678b
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/tegra210-adma.c
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@ -717,8 +717,8 @@ static int tegra_adma_probe(struct platform_device *pdev)
tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
tdc->irq = of_irq_get(pdev->dev.of_node, i);
if (tdc->irq < 0) {
ret = tdc->irq;
if (tdc->irq <= 0) {
ret = tdc->irq ?: -ENXIO;
goto irq_dispose;
}