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

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Date:   Wed, 14 Sep 2016 13:59:31 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Arnd Bergmann <arnd@...db.de>
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 09/14/16 13:23, Arnd Bergmann wrote:
> 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;

I opted to not do this because the data->blksz is validated later in the
function (twice).

It is not a big issue, but looks a bit odd.

-- 
Péter