Re: [PATCH 3/7] spi: spidev_test: allow disabling rx or tx buffers

[Mark Brown <broonie@kernel.org>]

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On Mon, Sep 14, 2026 at 04:50:42PM +0200, Jonas Rebmann wrote:
> From: Marc Kleine-Budde <mkl@pengutronix.de>
> 
> Allow not providing rx or tx buffers. This is useful to check if drivers
> that don't use SPI_CONTROLLER_MUST_RX (or -TX respectively) handle their
> operations correctly without a buffer.

> -	if (output_file) {
> +	if (rx && output_file) {
>  		out_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0666);
>  		if (out_fd < 0)
>  			pabort("could not open output file");

It'd be nice to complain if the user asks for output and no RX
simultaneously, but OTOH I'm sure the target audience can cope.

> -	if (input_tx && input_file)
> -		pabort("only one of -p and --input may be selected");
> +	if (!!input_tx + !!input_file + !do_tx > 0)
> +		pabort("only one of -p, -i (--input), -t (--no-tx) may be selected");

This logic is probably a bit *too* cute; it's far too hard to read.

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