linux-kernel - Re: [PATCH -next] spi: Fix double IDR allocation with DT aliases

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Message-ID: <20180821134044.GA18693@kroah.com>
Date:   Tue, 21 Aug 2018 15:40:44 +0200
From:   Greg KH <greg@...ah.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Mark Brown <broonie@...nel.org>,
        Kirill Kapranov <kirill.kapranov@...pulab.co.il>,
        linux-spi@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH -next] spi: Fix double IDR allocation with DT aliases

On Tue, Aug 21, 2018 at 11:53:03AM +0200, 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 <geert+renesas@...der.be>
> ---
> Seen on e.g. r8a7791/koelsch, breaking both RSPI and MSIOF.
> ---
>  drivers/spi/spi.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>