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SubjectRe: [PATCH -next] spi: Fix double IDR allocation with DT aliases
Hi Geert,

On Tue, Aug 21, 2018 at 6:53 AM, Geert Uytterhoeven
<> wrote:
> If the SPI bus number is provided by a DT alias, idr_alloc() is called
> twice, leading to:
> WARNING: CPU: 1 PID: 1 at drivers/spi/spi.c:2179 spi_register_controller+0x11c/0x5d8
> couldn't get idr
> Fix this by moving the handling of fixed SPI bus numbers up, before the
> DT handling code fills in ctlr->bus_num.
> Fixes: 1a4327fbf4554d5b ("spi: fix IDR collision on systems with both fixed and dynamic SPI bus numbers")
> Signed-off-by: Geert Uytterhoeven <>

This fixes SPI on imx51-babbage, thanks.

Tested-by: Fabio Estevam <>

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