linux-kernel - Re: [PATCH v7 1/4] driver core: don't always lock parent in shutdown

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Message-ID: <20240627055121.GA15415@lst.de>
Date: Thu, 27 Jun 2024 07:51:21 +0200
From: Christoph Hellwig <hch@....de>
To: Stuart Hayes <stuart.w.hayes@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Martin Belanger <Martin.Belanger@...l.com>,
	Oliver O'Halloran <oohall@...il.com>,
	Daniel Wagner <dwagner@...e.de>, Keith Busch <kbusch@...nel.org>,
	Lukas Wunner <lukas@...ner.de>, David Jeffery <djeffery@...hat.com>,
	Jeremy Allison <jallison@....com>, Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v7 1/4] driver core: don't always lock parent in
 shutdown

On Wed, Jun 26, 2024 at 02:46:47PM -0500, Stuart Hayes wrote:
> Don't lock a parent device unless it is needed in device_shutdown. This
> is in preparation for making device shutdown asynchronous, when it will
> be needed to allow children of a common parent to shut down
> simultaneously.

Looks good:

Reviewed-by: Christoph Hellwig <hch@....de>

.. but I guess this means async shutdown won't work well for busses
that set this flag (just usb currently)?