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mmc: omap_hsmmc: Initialize dma_slave_config to avoid random data

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It is wrong to use uninitialized dma_slave_config and configure only
certain fields as the DMAengine driver might look at non initialized
(random data) fields and tries to interpret it.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2016-09-14 14:22:07 +03:00 committed by Ulf Hansson
parent 3ae50f4512
commit e578960876
1 changed files with 8 additions and 8 deletions
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16
drivers/mmc/host/omap_hsmmc.c
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@ -1409,11 +1409,18 @@ static int omap_hsmmc_pre_dma_transfer(struct omap_hsmmc_host *host,
static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
struct mmc_request *req)
{
struct dma_slave_config cfg;
struct dma_async_tx_descriptor *tx;
int ret = 0, i;
struct mmc_data *data = req->data;
struct dma_chan *chan;
struct dma_slave_config cfg = {
.src_addr = host->mapbase + OMAP_HSMMC_DATA,
.dst_addr = host->mapbase + OMAP_HSMMC_DATA,
.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.src_maxburst = data->blksz / 4,
.dst_maxburst = data->blksz / 4,
};
/* Sanity check: all the SG entries must be aligned by block size. */
for (i = 0; i < data->sg_len; i++) {
@ -1433,13 +1440,6 @@ static int omap_hsmmc_setup_dma_transfer(struct omap_hsmmc_host *host,
chan = omap_hsmmc_get_dma_chan(host, data);
cfg.src_addr = host->mapbase + OMAP_HSMMC_DATA;
cfg.dst_addr = host->mapbase + OMAP_HSMMC_DATA;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
cfg.src_maxburst = data->blksz / 4;
cfg.dst_maxburst = data->blksz / 4;
ret = dmaengine_slave_config(chan, &cfg);
if (ret)
return ret;