linux-kernel - Re: [PATCH] mmc: omap_hsmmc: Initialize dma_slave

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Message-ID: <3300411.hNyGPzA0ak@wuerfel>
Date:   Wed, 14 Sep 2016 12:23:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     ulf.hansson@...aro.org, tony@...mide.com, kishon@...com,
        linux-omap@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: omap_hsmmc: Initialize dma_slave_config to avoid random data

On Wednesday, September 14, 2016 1:10:48 PM CEST Peter Ujfalusi wrote:
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 24ebc9a8de89..0a5640156159 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -1409,7 +1409,7 @@ 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_slave_config cfg = {};
>         struct dma_async_tx_descriptor *tx;
>         int ret = 0, i;
>         struct mmc_data *data = req->data;
> 

This change looks correct and is certainly the simplest solution if you want to
get it into v4.8, but generally speaking, I think it would be nicer to combine
it with the initialization of the fields:

	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;
	};

	Arnd