linux-kernel - Re: [PATCH] wilc1000: Remove misleading USE_SPI

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Date:   Tue, 7 Dec 2021 12:58:45 +0000
From:   <Ajay.Kathat@...rochip.com>
To:     <davidm@...uge.net>
CC:     <Claudiu.Beznea@...rochip.com>, <kvalo@...eaurora.org>,
        <davem@...emloft.net>, <kuba@...nel.org>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] wilc1000: Remove misleading USE_SPI_DMA macro

On 07/12/21 05:56, David Mosberger-Tang wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> The USE_SPI_DMA macro name suggests that it could be set to 1 to
> control whether or not SPI DMA should be used.  However, that's not
> what it does.  If set to 1, it'll set the SPI messages'
> "is_dma_mapped" flag to true, even though the tx/rx buffers aren't
> actually DMA mapped by the driver.  In other words, setting this flag
> to 1 will break the driver.
>
> Best to clean up this confusion by removing the macro altogether.
> There is no need to explicitly initialize "is_dma_mapped" because the
> message is cleared to zero anyhow, so "is_dma_mapped" is set to false
> by default.
>
> Signed-off-by: David Mosberger-Tang <davidm@...uge.net>


Thanks!


Acked-by: Ajay Singh <ajay.kathat@...rochip.com>


> ---
>   drivers/net/wireless/microchip/wilc1000/spi.c | 5 -----
>   1 file changed, 5 deletions(-)
>
> diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c
> index 640850f989dd..1856525b9834 100644
> --- a/drivers/net/wireless/microchip/wilc1000/spi.c
> +++ b/drivers/net/wireless/microchip/wilc1000/spi.c
> @@ -99,8 +99,6 @@ static int wilc_spi_reset(struct wilc *wilc);
>   #define DATA_PKT_LOG_SZ                                DATA_PKT_LOG_SZ_MAX
>   #define DATA_PKT_SZ                            (1 << DATA_PKT_LOG_SZ)
>
> -#define USE_SPI_DMA                            0
> -
>   #define WILC_SPI_COMMAND_STAT_SUCCESS          0
>   #define WILC_GET_RESP_HDR_START(h)             (((h) >> 4) & 0xf)
>
> @@ -240,7 +238,6 @@ static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len)
>                  memset(&msg, 0, sizeof(msg));
>                  spi_message_init(&msg);
>                  msg.spi = spi;
> -               msg.is_dma_mapped = USE_SPI_DMA;
>                  spi_message_add_tail(&tr, &msg);
>
>                  ret = spi_sync(spi, &msg);
> @@ -284,7 +281,6 @@ static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen)
>                  memset(&msg, 0, sizeof(msg));
>                  spi_message_init(&msg);
>                  msg.spi = spi;
> -               msg.is_dma_mapped = USE_SPI_DMA;
>                  spi_message_add_tail(&tr, &msg);
>
>                  ret = spi_sync(spi, &msg);
> @@ -323,7 +319,6 @@ static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen)
>                  memset(&msg, 0, sizeof(msg));
>                  spi_message_init(&msg);
>                  msg.spi = spi;
> -               msg.is_dma_mapped = USE_SPI_DMA;
>
>                  spi_message_add_tail(&tr, &msg);
>                  ret = spi_sync(spi, &msg);
> --
> 2.25.1
>