linux-kernel - Re: [PATCH v3 2/5] clkdev: Fix race condition in clock lookup from device tree

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Message-id: <52177E19.3080106@samsung.com>
Date:	Fri, 23 Aug 2013 17:22:01 +0200
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux@....linux.org.uk, mturquette@...aro.org,
	jiada_wang@...tor.com, broonie@...nel.org, vapier@...too.org,
	ralf@...ux-mips.org, kyungmin.park@...sung.com,
	myungjoo.ham@...sung.com, shawn.guo@...aro.org,
	sebastian.hesselbarth@...il.com, LW@...O-electronics.de,
	t.figa@...sung.com, g.liakhovetski@....de,
	laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org, linux-mips@...ux-mips.org,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH v3 2/5] clkdev: Fix race condition in clock lookup from
 device tree

On 08/23/2013 05:03 PM, Sylwester Nawrocki wrote:
> There is currently a race condition in the device tree part of clk_get()
> function, since the pointer returned from of_clk_get_by_name() may become
> invalid before __clk_get() call. I.e. due to the clock provider driver
> remove() callback being called in between of_clk_get_by_name() and
> __clk_get().
> 
> Fix this by doing both the look up and __clk_get() operations with the
> clock providers list mutex held. This ensures that the clock pointer
> returned from __of_clk_get_from_provider() call and passed to __clk_get()
> is valid, as long as the clock supplier module first removes its clock
> provider instance and then does clk_unregister() on the corresponding
> clocks.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>

Oops, I missed to add:

Reviewed-by: Mike Turquette <mturquette@...aro.org>

> Acked-by: Russell King <rmk+kernel@....linux.org.uk>
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