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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>,
	alsa-devel@alsa-project.org, linux-sh@vger.kernel.org,
	Kevin Hilman <khilman@deeprootsystems.com>,
	Sekhar Nori <nsekhar@ti.com>,
	Haojian Zhuang <haojian.zhuang@gmail.com>,
	Tony Lindgren <tony@atomide.com>, Daniel Mack <daniel@zonque.org>,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: Re: [PATCH 03/14] clkdev: get rid of redundant clk_add_alias() prototype in linux/clk.h
Date: Tue, 7 Apr 2015 13:42:25 +0100
Message-ID: <20150407124225.GI4027@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <5522D8B5.7050205@codeaurora.org>

On Mon, Apr 06, 2015 at 12:04:21PM -0700, Stephen Boyd wrote:
> On 04/04/15 05:43, Robert Jarzmik wrote:
> > Russell King <rmk+kernel@arm.linux.org.uk> writes:
> >
> >> clk_add_alias() is provided by clkdev, and is not part of the clk API.
> >> Howver, it is prototyped in two locations: linux/clkdev.h and
> >> linux/clk.h.  This is a mess.  Get rid of the redundant and unnecessary
> >> version in linux/clk.h.
> >>
> >> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
> > Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
> >
> > Actually, this serie fixes a regression I've seen in linux-next, and which was
> > triggering the Oops in [1] on lubbock. With your serie, the kernel boots fine.
> >
> >
> 
> Is this with the lubbock_defconfig? Is it a regression in 4.0-rc series
> or is it due to some pending -next patches interacting with the per-user
> clock patches? It looks like the latter because __clk_get_hw() should be
> inlined on lubbock_defconfig where CONFIG_COMMON_CLK=n.

It's a regression with anything that uses clk_add_alias() or which
open codes the aliasing of clocks, or registration of clocks into
clkdev.  It's quite nasty.

The problem is that the way you updated clkdev, by adding __clk_get_hw()
at clk_get() time, the struct clk which we're passing in there could
well have been already clk_put()'d, and therefore freed, and no longer
valid.

It's a regression ever since the per-user clk patches went in, caused
_entirely_ by those patches.

-- 
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.

  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-03 17:11 [PATCH 00/14] Fix fallout from per-user struct clk patches Russell King - ARM Linux
2015-04-03 17:12 ` [PATCH 01/14] clk: update clk API documentation to clarify clk_round_rate() Russell King
2015-04-03 17:12 ` [PATCH 02/14] clkdev: drop __init from clkdev_add_table() Russell King
2015-04-03 17:12 ` [PATCH 03/14] clkdev: get rid of redundant clk_add_alias() prototype in linux/clk.h Russell King
2015-04-03 23:49   ` Tony Lindgren
2015-04-04 12:43   ` Robert Jarzmik
2015-04-04 12:53     ` Russell King - ARM Linux
2015-04-06 19:04     ` Stephen Boyd
2015-04-07 10:05       ` Robert Jarzmik
2015-04-07 12:42       ` Russell King - ARM Linux [this message]
2015-04-06  5:50   ` Sekhar Nori
2015-04-03 17:12 ` [PATCH 04/14] clkdev: const-ify connection id to clk_add_alias() Russell King
2015-04-03 17:12 ` [PATCH 05/14] clkdev: use clk_hw internally Russell King
2015-04-06 20:18   ` Stephen Boyd
2015-04-03 17:12 ` [PATCH 06/14] clkdev: add clkdev_create() helper Russell King
2015-04-06 20:19   ` Stephen Boyd
2015-04-07 12:43     ` Russell King - ARM Linux
2015-04-07 23:09       ` Stephen Boyd
2015-04-03 17:12 ` [PATCH 07/14] media: omap3isp: remove unused clkdev Russell King
2015-04-03 21:44   ` Laurent Pinchart
2015-04-05 14:20     ` Russell King - ARM Linux
2015-04-07  9:42       ` Laurent Pinchart
2015-04-07 12:45         ` Russell King - ARM Linux
2015-04-07 14:38           ` Laurent Pinchart
2015-04-03 17:13 ` [PATCH 08/14] SH: use clkdev_add_table() Russell King
2015-04-03 17:13 ` [PATCH 09/14] ARM: lpc32xx: convert to " Russell King
2015-04-03 17:13 ` [PATCH 10/14] ARM: orion: use clkdev_create() Russell King
2015-04-04  0:17   ` Andrew Lunn
2015-04-07 13:20     ` Gregory CLEMENT
2015-04-07 14:01       ` Russell King - ARM Linux
2015-04-07 14:20         ` Gregory CLEMENT
2015-04-03 17:13 ` [PATCH 11/14] ARM: omap2: " Russell King
2015-04-03 23:49   ` Tony Lindgren
2015-04-03 17:13 ` [PATCH 12/14] ARM: omap2: use clkdev_add_alias() Russell King
2015-04-03 23:50   ` Tony Lindgren
2015-04-03 17:13 ` [PATCH 13/14] ASoC: migor: use clkdev_create() Russell King
2015-04-03 17:13 ` [PATCH 14/14] clk: s2mps11: " Russell King
2015-04-03 17:16 ` [PATCH 00/14] Fix fallout from per-user struct clk patches Russell King - ARM Linux
2015-04-05  9:04 ` Geert Uytterhoeven
2015-04-05 14:13   ` Russell King - ARM Linux

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