linux-kernel - Re: [PATCH 5/7] memory: renesas-rpc-if: Move resource acquisition to .probe()

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Date:   Wed, 29 Jun 2022 19:44:11 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Vignesh Raghavendra <vigneshr@...com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>
Cc:     Mark Brown <broonie@...nel.org>, linux-mtd@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] memory: renesas-rpc-if: Move resource acquisition to
 .probe()

On 27/06/2022 17:31, Geert Uytterhoeven wrote:
> While the acquired resources are tied to the lifetime of the RPC-IF core
> device (through the use of managed resource functions), the actual
> resource acquisition is triggered from the HyperBus and SPI child
> drivers.  Due to this mismatch, unbinding and rebinding the child
> drivers manually fails with -EBUSY:
> 
>     # echo rpc-if-hyperflash > /sys/bus/platform/drivers/rpc-if-hyperflash/unbind
>     # echo rpc-if-hyperflash > /sys/bus/platform/drivers/rpc-if-hyperflash/bind
>     rpc-if ee200000.spi: can't request region for resource [mem 0xee200000-0xee2001ff]
>     rpc-if-hyperflash: probe of rpc-if-hyperflash failed with error -16
> 
> Fix this by moving all resource acquisition to the core driver's probe
> routine.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

This looks like a fix, so how about putting it as first in the series,
so backporting is easy/automatic? Plus a fixes tag?

Best regards,
Krzysztof