[PATCH v2 02/15] spi: Drop duplicate IDR allocation code in spi_register_controller()

[Mark Brown]

On Mon, Jul 10, 2023 at 06:49:19PM +0300, Andy Shevchenko wrote:

> Refactor spi_register_controller() to drop duplicate IDR allocation.
> Instead of if-else-if branching use two sequential if:s, which allows
> to re-use the logic of IDR allocation in all cases.

For legibility this should have been split into a separate factoring out
of the shared code and rewriting of the logic, that'd make it trivial to
review.

> -		mutex_lock(&board_lock);
> -		id = idr_alloc(&spi_master_idr, ctlr, first_dynamic,
> -			       0, GFP_KERNEL);
> -		mutex_unlock(&board_lock);
> -		if (WARN(id < 0, "couldn't get idr"))
> -			return id;
> -		ctlr->bus_num = id;
> +		status = spi_controller_id_alloc(ctlr, first_dynamic, 0);
> +		if (status)
> +			return status;

The original does not do the remapping of return codes that the previous
two copies do...
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