linux-kernel - Re: [PATCH v5 00/39] i.MX Media Driver

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Message-ID: <20170312192932.GQ21222@n2100.armlinux.org.uk>
Date:   Sun, 12 Mar 2017 19:29:33 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     mark.rutland@....com, andrew-ct.chen@...iatek.com,
        minghsiu.tsai@...iatek.com, sakari.ailus@...ux.intel.com,
        nick@...anahar.org, songjun.wu@...rochip.com, hverkuil@...all.nl,
        Steve Longerbeam <steve_longerbeam@...tor.com>, pavel@....cz,
        robert.jarzmik@...e.fr, devel@...verdev.osuosl.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, shuah@...nel.org,
        geert@...ux-m68k.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...gutronix.de, arnd@...db.de,
        mchehab@...nel.org, bparrot@...com, robh+dt@...nel.org,
        horms+renesas@...ge.net.au, tiffany.lin@...iatek.com,
        linux-arm-kernel@...ts.infradead.org,
        niklas.soderlund+renesas@...natech.se, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jean-christophe.trotin@...com,
        p.zabel@...gutronix.de, fabio.estevam@....com, shawnguo@...nel.org,
        sudipm.mukherjee@...il.com
Subject: Re: [PATCH v5 00/39] i.MX Media Driver

On Sun, Mar 12, 2017 at 12:21:45PM -0700, Steve Longerbeam wrote:
> There's actually nothing preventing userland from disabling a link
> multiple times, and imx_media_link_notify() complies, and so
> csi_s_power(OFF) gets called multiple times, and so that WARN_ON()
> in there is silly, I borrowed this from other MC driver examples,
> but it makes no sense to me, I'll remove it and prevent the power
> count from going negative.

Hmm.  So what happens if one of the CSI's links is enabled, and we
disable a different link from the CSI several times?  Doesn't that
mean the power count will go to zero despite there being an enabled
link?

-- 
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