mmc: dw_mmc: prevent NULL dereference for dma_ops
Now, dma_ops is assumed that use the IDMAC. But if dma_ops is assigned the pdata->dma_ops, we didn't ensure that callback function is defined. If the callback isn't defined, then we should run in PIO mode. Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Will Newton <will.newton@imgtec.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -1881,7 +1881,8 @@ static void dw_mci_init_dma(struct dw_mci *host)
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if (!host->dma_ops)
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goto no_dma;
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if (host->dma_ops->init) {
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if (host->dma_ops->init && host->dma_ops->start &&
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host->dma_ops->stop && host->dma_ops->cleanup) {
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if (host->dma_ops->init(host)) {
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dev_err(&host->dev, "%s: Unable to initialize "
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"DMA Controller.\n", __func__);
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