From 2f5da678351f0d504966fab113968202aa5713fb Mon Sep 17 00:00:00 2001 From: Stefan Wahren Date: Sun, 11 Nov 2018 21:23:59 +0100 Subject: [PATCH] mmc: bcm2835: Properly handle dmaengine_prep_slave_sg In case dmaengine_prep_slave_sg fails we need to call dma_unmap_sg. Signed-off-by: Stefan Wahren Acked-by: Eric Anholt Signed-off-by: Ulf Hansson --- drivers/mmc/host/bcm2835.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c index 7733dbd..5029352 100644 --- a/drivers/mmc/host/bcm2835.c +++ b/drivers/mmc/host/bcm2835.c @@ -507,13 +507,16 @@ void bcm2835_prepare_dma(struct bcm2835_host *host, struct mmc_data *data) desc = dmaengine_prep_slave_sg(dma_chan, data->sg, sg_len, dir_slave, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (desc) { - desc->callback = bcm2835_dma_complete; - desc->callback_param = host; - host->dma_desc = desc; - host->dma_chan = dma_chan; - host->dma_dir = dir_data; + if (!desc) { + dma_unmap_sg(dma_chan->device->dev, data->sg, sg_len, dir_data); + return; } + + desc->callback = bcm2835_dma_complete; + desc->callback_param = host; + host->dma_desc = desc; + host->dma_chan = dma_chan; + host->dma_dir = dir_data; } static void bcm2835_start_dma(struct bcm2835_host *host) -- 2.7.4