linux-kernel - Re: [PATCH v1 3/3] spi: rockchip: Fix error in SPI slave pio read

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Date:   Wed, 22 Jul 2020 09:58:54 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Jon Lin <jon.lin@...k-chips.com>
Cc:     broonie@...nel.org, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] spi: rockchip: Fix error in SPI slave pio read

Hi Jon,

Am Mittwoch, 22. Juli 2020, 08:52:57 CEST schrieb Jon Lin:
> The RXFLR is possible larger than rx_left in Rockchip SPI, fix it.
> 
> Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
> ---
>  drivers/spi/spi-rockchip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
> index a451dacab5cf..1f5e613b67d9 100644
> --- a/drivers/spi/spi-rockchip.c
> +++ b/drivers/spi/spi-rockchip.c
> @@ -291,7 +291,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
>  static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
>  {
>  	u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
> -	u32 rx_left = rs->rx_left - words;
> +	u32 rx_left = rs->rx_left > words ? rs->rx_left - words : 0;

I guess for future readability of the code braces might be nice, like

	u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0;

But I stumbled onto (and fixed similarly) that issue yesterday as well, so

Reviewed-by: Heiko Stuebner <heiko@...ech.de>


Heiko