Re: [PATCH] spi: fix IDR collision on systems with both fixed and dynamic SPI bus numbers

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On Fri, Oct 13, 2017 at 05:59:46PM +0200, Lucas Stach wrote:

> Fix this by skipping all known alias numbers when assigning the dynamic IDs.

> -		id = idr_alloc(&spi_master_idr, ctlr, SPI_DYN_FIRST_BUS_NUM, 0,
> -			       GFP_KERNEL);
> +		id = idr_alloc(&spi_master_idr, ctlr,
> +			       of_alias_get_highest_id("spi") + 1,
> +			       0, GFP_KERNEL);

I'll apply this but I'm wondering if we want to have the static bus
number allocation also allocate that number out of the IDR so the IDR
code handles things more transparently.  Feels like it's more trouble
than it's worth though, this should work fine.  I'm also worrying about
the case where IDR allocated a number before a static assignment got to
it...  not much we can do to guarantee that we avoid that case though.

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