linux-kernel - Re: [PATCH v2 0/3] drivers: base: Add tests showing devm handling inconsistencies

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Message-ID: <vwku5mxdcbiqc72btevqcd5t533re6mlhhw4dywuajnoboyuuf@d4qi3thi55u7>
Date:   Tue, 18 Jul 2023 16:35:43 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] drivers: base: Add tests showing devm handling
 inconsistencies

On Wed, Jun 28, 2023 at 11:49:20AM +0200, Maxime Ripard wrote:
> Hi,
> 
> This follows the discussion here:
> https://lore.kernel.org/linux-kselftest/20230324123157.bbwvfq4gsxnlnfwb@houat/
> 
> This shows a couple of inconsistencies with regard to how device-managed
> resources are cleaned up. Basically, devm resources will only be cleaned up
> if the device is attached to a bus and bound to a driver. Failing any of
> these cases, a call to device_unregister will not end up in the devm
> resources being released.
> 
> We had to work around it in DRM to provide helpers to create a device for
> kunit tests, but the current discussion around creating similar, generic,
> helpers for kunit resumed interest in fixing this.
> 
> This can be tested using the command:
> ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/base/test/
> 
> I added the fix David suggested back in that discussion which does fix
> the tests. The SoB is missing, since David didn't provide it back then.

Ping?

Maxime

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