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Subject[PATCH] dmaengine: fsl-edma: clear pending interrupts on initialization
Date
Clear pending interrupts before requesting interrupts and move
interrupt initialization after channels have been initialized.
This avoids a NULL pointer dereference panic when using kexec
while DMA requests were running.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
drivers/dma/fsl-edma.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c
index 09e2842..915eec3 100644
--- a/drivers/dma/fsl-edma.c
+++ b/drivers/dma/fsl-edma.c
@@ -881,10 +881,6 @@ static int fsl_edma_probe(struct platform_device *pdev)

}

- ret = fsl_edma_irq_init(pdev, fsl_edma);
- if (ret)
- return ret;
-
fsl_edma->big_endian = of_property_read_bool(np, "big-endian");

INIT_LIST_HEAD(&fsl_edma->dma_dev.channels);
@@ -900,6 +896,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_edma_chan_mux(fsl_chan, 0, false);
}

+ edma_writel(fsl_edma, ~0, fsl_edma->membase + EDMA_INTR);
+ ret = fsl_edma_irq_init(pdev, fsl_edma);
+ if (ret)
+ return ret;
+
dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask);
dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask);
--
2.4.2


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