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

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Message-ID: <20160914112154.4567-1-peter.ujfalusi@ti.com>
Date:   Wed, 14 Sep 2016 14:21:54 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <ulf.hansson@...aro.org>, <arnd@...db.de>
CC:     <tony@...mide.com>, <kishon@...com>, <linux-omap@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] mmc: omap: Initialize dma_slave_config to avoid random data in it's fields

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@...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