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dmaengine: fsl-edma: fix for missing dmamux module
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 <angelo.dureghello@timesys.com> Link: https://lore.kernel.org/r/20210901211610.662077-1-angelo.dureghello@timesys.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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1 changed files with 3 additions and 1 deletions
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@ -638,12 +638,14 @@ EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);
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void fsl_edma_free_chan_resources(struct dma_chan *chan)
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{
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struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
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struct fsl_edma_engine *edma = fsl_chan->edma;
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unsigned long flags;
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LIST_HEAD(head);
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spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
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fsl_edma_disable_request(fsl_chan);
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fsl_edma_chan_mux(fsl_chan, 0, false);
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if (edma->drvdata->dmamuxs)
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fsl_edma_chan_mux(fsl_chan, 0, false);
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fsl_chan->edesc = NULL;
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vchan_get_all_descriptors(&fsl_chan->vchan, &head);
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fsl_edma_unprep_slave_dma(fsl_chan);
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