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| author | Angelo Dureghello <angelo.dureghello@timesys.com> | 2021-09-02 00:16:10 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-10-25 09:39:14 +0300 |
| commit | 5b5b5aa50d1b90392f13afd15089e191d57316f5 (patch) | |
| tree | f31f7ecd41a012d4e5cf46e1b9da8e24ba597f32 /drivers/dma/fsl-edma-common.c | |
| parent | ee5c6f0ca219b65f5085043d481d9b6f045693d5 (diff) | |
| download | linux-5b5b5aa50d1b90392f13afd15089e191d57316f5.tar.xz | |
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>
Diffstat (limited to 'drivers/dma/fsl-edma-common.c')
| -rw-r--r-- | drivers/dma/fsl-edma-common.c | 4 |
1 files changed, 3 insertions, 1 deletions
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); |