linux-kernel - Re: [PATCH] spi: spidev: mask SPI_CS_HIGH in SPI_IOC_RD

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Date:   Wed, 30 Nov 2022 14:57:59 +0000
From:   Mark Brown <broonie@...nel.org>
To:     "A. Sverdlin" <alexander.sverdlin@...mens.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH] spi: spidev: mask SPI_CS_HIGH in SPI_IOC_RD_MODE

On Wed, Nov 30, 2022 at 03:39:48PM +0100, A. Sverdlin wrote:

>  	/* read requests */
>  	case SPI_IOC_RD_MODE:
> -		retval = put_user(spi->mode & SPI_MODE_MASK,
> -					(__u8 __user *)arg);
> +		tmp = spi->mode;
> +
> +		{
> +			struct spi_controller *ctlr = spi->controller;
> +
> +			if (ctlr->use_gpio_descriptors && ctlr->cs_gpiods &&
> +			    ctlr->cs_gpiods[spi->chip_select])
> +				tmp &= ~SPI_CS_HIGH;
> +		}
> +
> +		retval = put_user(tmp & SPI_MODE_MASK, (__u8 __user *)arg);
>  		break;
>  	case SPI_IOC_RD_MODE32:
>  		retval = put_user(spi->mode & SPI_MODE_MASK,

What about SPI_IOC_RD_MODE_32?  On the write path the code is shared...

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