linux-kernel - Re: [PATCH] media: omap3isp: zero-initialize the isp cam

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Date:   Thu, 14 Jun 2018 15:47:46 +0200
From:   Pavel Machek <pavel@....cz>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] media: omap3isp: zero-initialize the isp cam_xclk{a,b}
 initial data

On Sat 2018-06-09 10:39:12, Javier Martinez Canillas wrote:
> The struct clk_init_data defined in isp_xclk_init() is a variable in the
> stack but it's not explicitly zero-initialized. Because of that, in some
> cases the data structure contains values that confuses the clk framework.
> 
> For example if the flags member has the CLK_IS_CRITICAL bit set, the clk
> framework will wrongly prepare the clock on registration. This leads to
> the isp_xclk_prepare() callback to be called which in turn calls to the
> omap3isp_get() function that increments the isp device reference counter.
> 
> Since this omap3isp_get() call is unexpected, this leads to an unbalanced
> omap3isp_get() call that prevents the requested IRQ to be later enabled,
> due the refcount not being 0 when the correct omap3isp_get() call happens.
> 
> Fixes: 9b28ee3c9122 ("[media] omap3isp: Use the common clock framework")
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

Tested-by: Pavel Machek <pavel@....cz>

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