linux-kernel - Re: [PATCH 01/12] crypto: caam - make sure clocks are enabled first

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Message-ID: <VI1PR0402MB3485E5EBBC1DCEF17103964898BA0@VI1PR0402MB3485.eurprd04.prod.outlook.com>
Date:   Fri, 6 Sep 2019 11:18:19 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
CC:     Chris Healy <cphealy@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Iuliana Prodan <iuliana.prodan@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/12] crypto: caam - make sure clocks are enabled first

On 9/4/2019 5:35 AM, Andrey Smirnov wrote:
> In order to access IP block's registers we need to enable appropriate
> clocks first, otherwise we are risking hanging the CPU.
> 
> The problem becomes very apparent when trying to use CAAM driver built
> as a kernel module. In that case caam_probe() gets called after
> clk_disable_unused() which means all of the necessary clocks are
> guaranteed to be disabled.
> 
> Coincidentally, this change also fixes iomap leak introduced by early
> return (instead of "goto iounmap_ctrl") in commit
> 41fc54afae70 ("crypto: caam - simplfy clock initialization")
> 
> Tested on ZII i.MX6Q+ RDU2
> 
> Fixes: 176435ad2ac7 ("crypto: caam - defer probing until QMan is available")
> Fixes: 41fc54afae70 ("crypto: caam - simplfy clock initialization")
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Lucas Stach <l.stach@...gutronix.de>
> Cc: Horia Geantă <horia.geanta@....com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: Iuliana Prodan <iuliana.prodan@....com>
> Cc: linux-crypto@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
Tested-by: Horia Geantă <horia.geanta@....com>

Considering this is a boot hang, in case this does not make into v5.4
I would appreciate appending:
Cc: <stable@...r.kernel.org>

Thanks,
Horia