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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Daniel Vetter <daniel@ffwll.ch>, Lukas Wunner <lukas@wunner.de>,
	Andrzej Hajda <a.hajda@samsung.com>,
	Russell King - ARM Linux <linux@armlinux.org.uk>,
	Lucas Stach <l.stach@pengutronix.de>,
	Linus Walleij <linus.walleij@linaro.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: [PATCH 0/6] driver core: Fix some issues related to device links
Date: Thu, 24 Jan 2019 12:13:06 +0100
Message-ID: <2493187.oiOpCWJBV7@aspire.rjw.lan> (raw)

Hi Greg at al,

Recently I have been looking at the device links code because of the
recent discussion on possibly using them in the DRM subsystem (see for
example https://marc.info/?l=linux-pm&m=154832771905309&w=2) and I have
found a few issues in that code which should be addressed by this patch
series.  Please refer to the patch changelogs for details.

None of the problems addressed here should be manifesting themselves in
mainline kernel today, but if there are more device links users in the
future, they most likely will be encountered sooner or later.  Also they
need to be fixed for the DRM use case to be supported IMO.

This series does not fix all issues in device links that have become
apparent (generally speaking, the idea of returning an existing link
in case there is one already for the given consumer-supplier pair
doesn't play well with stateful links and their flags), so there will
be a follow-up series of patches to clean that up.  Still, I don't see
a reason to sit on these fixes while working on the other patches, so
here they go.

Cheers,
Rafael


             reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-24 11:13 Rafael J. Wysocki [this message]
2019-01-24 11:15 ` [PATCH 1/6] driver core: Fix DL_FLAG_AUTOREMOVE_SUPPLIER device link flag handling Rafael J. Wysocki
2019-01-24 11:16 ` [PATCH 2/6] driver core: Reorder actions in __device_links_no_driver() Rafael J. Wysocki
2019-01-24 11:18 ` [PATCH 3/6] driver core: Avoid careless re-use of existing device links Rafael J. Wysocki
2019-01-24 11:19 ` [PATCH 4/6] driver core: Do not resume suppliers under device_links_write_lock() Rafael J. Wysocki
2019-01-24 11:21 ` [PATCH 5/6] driver core: Fix handling of runtime PM flags in device_link_add() Rafael J. Wysocki
2019-01-25 11:18   ` [PATCH v2 " Rafael J. Wysocki
2019-01-24 11:23 ` [PATCH 6/6] driver core: Fix adding device links to probing suppliers Rafael J. Wysocki
2019-01-24 14:58 ` [PATCH 0/6] driver core: Fix some issues related to device links Russell King - ARM Linux admin
2019-01-24 23:08   ` Rafael J. Wysocki
2019-01-31 10:09 ` Rafael J. Wysocki
2019-01-31 13:22   ` Greg Kroah-Hartman
2019-01-31 13:24     ` Greg Kroah-Hartman
2019-01-31 16:02       ` Rafael J. Wysocki
2019-01-31 18:24         ` Greg Kroah-Hartman
2019-01-31 18:36           ` Rafael J. Wysocki
2019-01-31 23:50           ` Rafael J. Wysocki
2019-02-01  0:12             ` Greg Kroah-Hartman
2019-02-01  0:20               ` Rafael J. Wysocki
2019-01-31 16:03       ` Ulf Hansson

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