linux-kernel - Re: [PATCH v2 1/2] mfd: intel_quark_i2c_gpio: remove clock tree on error path

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Message-ID: <20160316084659.GX13692@x1>
Date:	Wed, 16 Mar 2016 08:46:59 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mfd: intel_quark_i2c_gpio: remove clock tree on
 error path

On Thu, 10 Mar 2016, Andy Shevchenko wrote:

> On Fri, 2016-02-19 at 10:42 +0200, Andy Shevchenko wrote:
> > There is a potential resource leak in case when ->probe() fails. We
> > have to
> > unregister and remove clock tree which is done here.
> > 
> > This is a follow up to previously pushed commit c4726abce63b ("mfd:
> > intel_quark_i2c_gpio: Use clkdev_create()") that prevents double
> > free() when
> > clkdev_drop() followed by kfree() in devm_kcalloc() release stage.
> > 
> > I leave Fixes tag here, but the backporting will require to backport
> > the commit
> > c4726abce63b ("mfd: intel_quark_i2c_gpio: Use clkdev_create()")
> > first.
> 
> Lee, ping?

Pings don't serve any purpose but to irritate.  This patch hasn't
been forgotten, it's in the pile.

The last few weeks have been pretty crazy.  Please bear with me while I
play catch-up.

> > Fixes: 60ae5b9f5cdd (mfd: intel_quark_i2c_gpio: Add Intel Quark X1000
> > I2C-GPIO MFD Driver)
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> > v2:
> > - do not unregister clock before lookup (Stephen)
> >  drivers/mfd/intel_quark_i2c_gpio.c | 25 +++++++++++++++++--------
> >  1 file changed, 17 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/mfd/intel_quark_i2c_gpio.c
> > b/drivers/mfd/intel_quark_i2c_gpio.c
> > index bdc5e27..7450f5d 100644
> > --- a/drivers/mfd/intel_quark_i2c_gpio.c
> > +++ b/drivers/mfd/intel_quark_i2c_gpio.c
> > @@ -139,6 +139,7 @@ static int intel_quark_register_i2c_clk(struct
> > intel_quark_mfd *quark_mfd)
> >  						INTEL_QUARK_I2C_CONT
> > ROLLER_CLK);
> >  
> >  	if (!quark_mfd->i2c_clk_lookup) {
> > +		clk_unregister(quark_mfd->i2c_clk);
> >  		dev_err(&pdev->dev, "Fixed clk register failed\n");
> >  		return -ENOMEM;
> >  	}
> > @@ -150,7 +151,7 @@ static void intel_quark_unregister_i2c_clk(struct
> > pci_dev *pdev)
> >  {
> >  	struct intel_quark_mfd *quark_mfd = dev_get_drvdata(&pdev-
> > >dev);
> >  
> > -	if (!quark_mfd->i2c_clk || !quark_mfd->i2c_clk_lookup)
> > +	if (!quark_mfd->i2c_clk_lookup)
> >  		return;
> >  
> >  	clkdev_drop(quark_mfd->i2c_clk_lookup);
> > @@ -246,25 +247,33 @@ static int intel_quark_mfd_probe(struct pci_dev
> > *pdev,
> >  	quark_mfd = devm_kzalloc(&pdev->dev, sizeof(*quark_mfd),
> > GFP_KERNEL);
> >  	if (!quark_mfd)
> >  		return -ENOMEM;
> > +
> >  	quark_mfd->pdev = pdev;
> > +	dev_set_drvdata(&pdev->dev, quark_mfd);
> >  
> >  	ret = intel_quark_register_i2c_clk(quark_mfd);
> >  	if (ret)
> >  		return ret;
> >  
> > -	dev_set_drvdata(&pdev->dev, quark_mfd);
> > -
> >  	ret = intel_quark_i2c_setup(pdev,
> > &intel_quark_mfd_cells[1]);
> >  	if (ret)
> > -		return ret;
> > +		goto err_unregister_i2c_clk;
> >  
> >  	ret = intel_quark_gpio_setup(pdev,
> > &intel_quark_mfd_cells[0]);
> >  	if (ret)
> > -		return ret;
> > +		goto err_unregister_i2c_clk;
> >  
> > -	return mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
> > -			       ARRAY_SIZE(intel_quark_mfd_cells),
> > NULL, 0,
> > -			       NULL);
> > +	ret = mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
> > +			      ARRAY_SIZE(intel_quark_mfd_cells),
> > NULL, 0,
> > +			      NULL);
> > +	if (ret)
> > +		goto err_unregister_i2c_clk;
> > +
> > +	return 0;
> > +
> > +err_unregister_i2c_clk:
> > +	intel_quark_unregister_i2c_clk(pdev);
> > +	return ret;
> >  }
> >  
> >  static void intel_quark_mfd_remove(struct pci_dev *pdev)
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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