linux-kernel - Re: [PATCH v4 4/6] drm/dsi: Check for used channels

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Message-ID: <20160121161059.GD647@ulmo.nvidia.com>
Date:	Thu, 21 Jan 2016 17:11:01 +0100
From:	Thierry Reding <treding@...dia.com>
To:	Archit Taneja <architt@...eaurora.org>
CC:	<dri-devel@...ts.freedesktop.org>, <a.hajda@...sung.com>,
	<jani.nikula@...ux.intel.com>, <linux-kernel@...r.kernel.org>,
	<airlied@...ux.ie>, <daniel@...ll.ch>, <l.stach@...gutronix.de>,
	<robh@...nel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] drm/dsi: Check for used channels

On Thu, Dec 10, 2015 at 06:11:38PM +0530, Archit Taneja wrote:
> We don't check whether a previously registered mipi_dsi_device under the
> same host shares the same virtual channel.
> 
> Before registering, check if any of the registered devices doesn't
> already have the same virtual channel.
> 
> This wasn't crucial when all the devices under a host were populated via
> DT. Now that we also support creating devices manually, we could end up
> in a situation where a driver tries to create a device with a virtual
> channel already taken by a device populated in DT.
> 
> Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>
> Signed-off-by: Archit Taneja <architt@...eaurora.org>
> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 26 ++++++++++++++++++++++++--
>  1 file changed, 24 insertions(+), 2 deletions(-)

I don't think this is necessary. The device name will be composed of the
host's name, a '.' and the virtual channel ID, and the device core will
refuse to create two devices with the same name.

Thierry

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