[PATCH] dmaengine: fsl-edma: fix for missing dmamux module
From: Angelo Dureghello <hidden>
Date: 2021-09-01 21:26:10
Fix following panic on system halt: Requesting system halt [ 10.600000] spi spi0.1: spi_device 0.1 cleanup [ 10.630000] fsl_edma_chan_mux() fsl_chan->edma->n_chans 64 dmamux_nr 0 [ 10.630000] *** ZERO DIVIDE *** FORMAT=4 [ 10.630000] Current process id is 38 [ 10.630000] BAD KERNEL TRAP: 00000000 [ 10.630000] PC: [<402f09ba>] fsl_edma_chan_mux+0x7c/0x12e ... Some architecture as mcf5441x (ColdFire) may not have a dmamux, so dmamux_nr is set to 0. This patch considers this case. Signed-off-by: Angelo Dureghello <redacted> --- drivers/dma/fsl-edma-common.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index 930ae268c497..009c75ff1320 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c@@ -638,12 +638,14 @@ EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources); void fsl_edma_free_chan_resources(struct dma_chan *chan) { struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + struct fsl_edma_engine *edma = fsl_chan->edma; unsigned long flags; LIST_HEAD(head); spin_lock_irqsave(&fsl_chan->vchan.lock, flags); fsl_edma_disable_request(fsl_chan); - fsl_edma_chan_mux(fsl_chan, 0, false); + if (edma->drvdata->dmamuxs) + fsl_edma_chan_mux(fsl_chan, 0, false); fsl_chan->edesc = NULL; vchan_get_all_descriptors(&fsl_chan->vchan, &head); fsl_edma_unprep_slave_dma(fsl_chan);
--
2.32.0
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