[PATCH 7/7] mmc: bcm2835: Properly handle dmaengine_prep_slave_sg
From: Stefan Wahren <hidden>
Date: 2018-11-11 13:45:30
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
In case dmaengine_prep_slave_sg fails we need to call dma_unmap_sg. Signed-off-by: Stefan Wahren <redacted> --- 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 c42bdaa..82e4b08 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c@@ -518,13 +518,16 @@ 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