linux-kernel - Re: [PATCH 2/3] staging: vchiq_arm: get rid of global device structure

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Date:   Thu, 5 May 2022 14:11:10 -0400
From:   Adrien Thierry <athierry@...hat.com>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        linux-staging@...ts.linux.dev,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] staging: vchiq_arm: get rid of global device
 structure

Hi Stefan,

Thanks for your feedback.

> i understand the motivation, but could you please explain more in detail
> why you decided to add vchiq_instance instead of device reference? I
> think vchiq_instance is a more internal structure which should be
> avoided in kernel consumers like bcm2835-audio or mmal.

I used the vchiq_instance instead of the device reference because in order
to get rid of the vchiq_states array (patch 3/3 [1]), I needed another way
to access the vchiq_state in the 'handle_to_service' function. So I passed
the vchiq_instance to it (I could also have passed the state directly
instead of the instance), and this propagated in the caller chain all the
way up to 'vchiq_bulk_transmit' and friends which are used in the
bcm2835-audio consumer.  Please let me know if you see a better way of
doing this :)

Thanks,

Adrien

[1] https://lore.kernel.org/all/20220502183045.206519-4-athierry@redhat.com/