When the ccerr handler is called but the error registers indicate no error events we need to command eDMA to re-evaluate the errors. Otherwise we can receive flood of error interrupts.
Reported-by: Roger Quadros <[email protected]> Signed-off-by: Peter Ujfalusi <[email protected]> --- drivers/dma/edma.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 10f9b992b927..7c76b558cf82 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -1540,8 +1540,17 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data) dev_vdbg(ecc->dev, "dma_ccerr_handler\n"); - if (!edma_error_pending(ecc)) + if (!edma_error_pending(ecc)) { + /* + * The registers indicate no pending error event but the irq + * handler has been called. + * Ask eDMA to re-evaluate the error registers. + */ + dev_err(ecc->dev, "%s: Error interrupt without error event!\n", + __func__); + edma_write(ecc, EDMA_EEVAL, 1); return IRQ_NONE; + } while (1) { /* Event missed register(s) */ -- 2.8.2
