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From: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
To: Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>,
	linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Russell King <linux@armlinux.org.uk>,
	Jeffrey Hugo <jhugo@codeaurora.org>, Chen-Yu Tsai <wens@csie.org>
Subject: Re: [PATCH v4 1/9] clkdev: Hold clocks_mutex while iterating clocks list
Date: Mon, 15 Apr 2019 08:22:14 +0300	[thread overview]
Message-ID: <20190415052214.GA31948@localhost.localdomain> (raw)
In-Reply-To: <20190412183150.102131-2-sboyd@kernel.org>

On Fri, Apr 12, 2019 at 11:31:42AM -0700, Stephen Boyd wrote:
> We recently introduced a change to support devm clk lookups. That change
> introduced a code-path that used clk_find() without holding the
> 'clocks_mutex'. Unfortunately, clk_find() iterates over the 'clocks'
> list and so we need to prevent the list from being modified at the same
> time. Do this by holding the mutex and checking to make sure it's held
> while iterating the list.
> 
> Note, we don't really care if the lookup is freed after we find it with
> clk_find() because we're just doing a pointer comparison, but if we did
> care we would need to keep holding the mutex while we dereference the
> clk_lookup pointer.
> 
> Fixes: 3eee6c7d119c ("clkdev: add managed clkdev lookup registration")
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Jerome Brunet <jbrunet@baylibre.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: Jeffrey Hugo <jhugo@codeaurora.org>
> Cc: Chen-Yu Tsai <wens@csie.org>
> Cc: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Acked-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>

  reply	other threads:[~2019-04-15  5:22 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-12 18:31 [PATCH v4 0/9] Rewrite clk parent handling Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 1/9] clkdev: Hold clocks_mutex while iterating clocks list Stephen Boyd
2019-04-15  5:22   ` Matti Vaittinen [this message]
2019-04-18 20:34   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 2/9] clkdev: Move clk creation outside of 'clocks_mutex' Stephen Boyd
2019-04-19 22:12   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 3/9] clk: Prepare for clk registration API that uses DT nodes Stephen Boyd
2019-04-19 22:12   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 4/9] driver core: Let dev_of_node() accept a NULL dev Stephen Boyd
2019-04-16 13:29   ` Greg Kroah-Hartman
2019-04-19 22:12   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 5/9] clk: Add of_clk_hw_register() API for early clk drivers Stephen Boyd
2019-04-19 22:12   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 6/9] clk: Allow parents to be specified without string names Stephen Boyd
2019-04-19 22:12   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 7/9] clk: Look for parents with clkdev based clk_lookups Stephen Boyd
2019-04-19 22:13   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 8/9] clk: Allow parents to be specified via clkspec index Stephen Boyd
2019-04-19 22:13   ` Stephen Boyd
2019-04-12 18:31 ` [PATCH v4 9/9] clk: fixed-factor: Let clk framework find parent Stephen Boyd
2019-04-19 22:13   ` Stephen Boyd
2019-04-23 18:09   ` Guenter Roeck
2019-04-23 18:22     ` Stephen Boyd
2019-04-23 19:26       ` Guenter Roeck
2019-04-15 18:05 ` [PATCH v4 0/9] Rewrite clk parent handling Jeffrey Hugo

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