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Subject: Re: [PATCH] ata: ep93xx: Use proper enums for directions
To:     Nathan Chancellor <natechancellor@gmail.com>
Cc:     Jens Axboe <axboe@kernel.dk>, linux-ide@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Nick Desaulniers <ndesaulniers@google.com>
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Date:   Thu, 4 Oct 2018 13:48:33 +0200
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On 10/04/2018 04:37 AM, Nathan Chancellor wrote:
> Clang warns when one enumerated type is implicitly converted to another.
> 
> drivers/ata/pata_ep93xx.c:662:36: warning: implicit conversion from
> enumeration type 'enum dma_data_direction' to different enumeration type
> 'enum dma_transfer_direction' [-Wenum-conversion]
>         drv_data->dma_rx_data.direction = DMA_FROM_DEVICE;
>                                         ~ ^~~~~~~~~~~~~~~
> drivers/ata/pata_ep93xx.c:670:36: warning: implicit conversion from
> enumeration type 'enum dma_data_direction' to different enumeration type
> 'enum dma_transfer_direction' [-Wenum-conversion]
>         drv_data->dma_tx_data.direction = DMA_TO_DEVICE;
>                                         ~ ^~~~~~~~~~~~~
> drivers/ata/pata_ep93xx.c:681:19: warning: implicit conversion from
> enumeration type 'enum dma_data_direction' to different enumeration type
> 'enum dma_transfer_direction' [-Wenum-conversion]
>         conf.direction = DMA_FROM_DEVICE;
>                        ~ ^~~~~~~~~~~~~~~
> drivers/ata/pata_ep93xx.c:692:19: warning: implicit conversion from
> enumeration type 'enum dma_data_direction' to different enumeration type
> 'enum dma_transfer_direction' [-Wenum-conversion]
>         conf.direction = DMA_TO_DEVICE;
>                        ~ ^~~~~~~~~~~~~
> 
> Use the equivalent valued enums from the expected type so that Clang no
> longer warns about a conversion.
> 
> DMA_TO_DEVICE = DMA_MEM_TO_DEV = 1
> DMA_FROM_DEVICE = DMA_DEV_TO_MEM = 2
> 
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics