[PATCH v2] mmc: omap: Initialize dma_slave_config to avoid random data in it's fields

[Peter Ujfalusi]

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.ujfal...@ti.com>
---
Hi,

Changes since v1:
- do the field initialization in one step

would it be possible to send this patch for 4.8? I have omap-dma DMAengine
driver changes pending, but they break the MMC/SD because of the uninitialized
fields in dma_slave_config.

Thanks,
Peter

 drivers/mmc/host/omap.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index f23d65eb070d..be3c49fa7382 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -1016,14 +1016,16 @@ mmc_omap_prepare_data(struct mmc_omap_host *host, 
struct mmc_request *req)

                /* Only reconfigure if we have a different burst size */
                if (*bp != burst) {
-                       struct dma_slave_config cfg;
-
-                       cfg.src_addr = host->phys_base + OMAP_MMC_REG(host, 
DATA);
-                       cfg.dst_addr = host->phys_base + OMAP_MMC_REG(host, 
DATA);
-                       cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-                       cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
-                       cfg.src_maxburst = burst;
-                       cfg.dst_maxburst = burst;
+                       struct dma_slave_config cfg = {
+                               .src_addr = host->phys_base +
+                                           OMAP_MMC_REG(host, DATA),
+                               .dst_addr = host->phys_base +
+                                           OMAP_MMC_REG(host, DATA),
+                               .src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
+                               .dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES,
+                               .src_maxburst = burst,
+                               .dst_maxburst = burst,
+                       };

                        if (dmaengine_slave_config(c, &cfg))
                                goto use_pio;
--
2.10.0