diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 84ac38dbdb65c6e84d60ecfd15acd9855ac32b90..504420f213ff76859ab8334812ec4ac56477cf6d 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -770,8 +770,14 @@ struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask) return ERR_PTR(-ENODEV); chan = __dma_request_channel(mask, NULL, NULL); - if (!chan) - chan = ERR_PTR(-ENODEV); + if (!chan) { + mutex_lock(&dma_list_mutex); + if (list_empty(&dma_device_list)) + chan = ERR_PTR(-EPROBE_DEFER); + else + chan = ERR_PTR(-ENODEV); + mutex_unlock(&dma_list_mutex); + } return chan; }