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From: Greg KH <gregkh@linuxfoundation.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Mark Brown <broonie@kernel.org>,
	milo.kim@ti.com, axel.lin@ingics.com,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	olof@lixom.net, javier.martinez@collabora.co.uk,
	Paul Stewart <pstew@chromium.org>,
	stable@vger.kernel.org, lgirdwood@gmail.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] regulator: core: Fix enable GPIO reference counting
Date: Fri, 27 Feb 2015 12:08:46 -0800	[thread overview]
Message-ID: <20150227200846.GA17514@kroah.com> (raw)
In-Reply-To: <1425066064-18920-1-git-send-email-dianders@chromium.org>

On Fri, Feb 27, 2015 at 11:41:03AM -0800, Doug Anderson wrote:
> It is possible for _regulator_do_enable() to be called for an
> already-enabled rdev, like in regulator_suspend_finish().  If we were
> using an enable pin (rdev->ena_pin is set) then we'd end up
> incrementing the reference count in regulator_ena_gpio_ctrl() over and
> over again without a decrement.  That prevented the GPIO from going to
> the "off" state even after all users were disabled.
> 
> Fix this by avoiding the call to regulator_ena_gpio_ctrl() when it's
> not needed.
> 
> Signed-off-by: Doug Anderson <dianders@chromium.org>
> Fixes: 967cfb18c0e3 ("regulator: core: manage enable GPIO list")
> ---
> FYI: this was developed and tested against a 3.14 kernel with
> backports; I've done basic boot testing against upstream and sanity
> checked the code but haven't done as extensive testing there.
> 
>  drivers/regulator/core.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>

  reply	other threads:[~2015-02-27 20:08 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-27 19:41 Doug Anderson
2015-02-27 20:08 ` Greg KH [this message]
2015-02-27 21:01 ` Javier Martinez Canillas
2015-03-02 18:57   ` Mark Brown
2015-03-02 20:21     ` Javier Martinez Canillas
2015-03-03 14:24       ` Mark Brown
2015-03-02 18:47 ` Mark Brown
2015-03-02 21:13   ` Doug Anderson
2015-03-03 14:23     ` Mark Brown
2015-03-03 23:21       ` Doug Anderson
2015-03-04 11:27         ` Mark Brown
2015-03-04 17:13           ` Doug Anderson

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