linux-kernel - [PATCH v1 1/2] mfd: intel_quark_i2c_gpio: remove clock tree on error path

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Date:	Wed, 17 Feb 2016 12:29:32 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/2] mfd: intel_quark_i2c_gpio: remove clock tree on error path

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.

Fixes: 60ae5b9f5cdd (mfd: intel_quark_i2c_gpio: Add Intel Quark X1000 I2C-GPIO MFD Driver)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/mfd/intel_quark_i2c_gpio.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c
index bdc5e27..43d8066 100644
--- a/drivers/mfd/intel_quark_i2c_gpio.c
+++ b/drivers/mfd/intel_quark_i2c_gpio.c
@@ -150,11 +150,10 @@ 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)
+	clk_unregister(quark_mfd->i2c_clk);
+	if (!quark_mfd->i2c_clk_lookup)
 		return;
-
 	clkdev_drop(quark_mfd->i2c_clk_lookup);
-	clk_unregister(quark_mfd->i2c_clk);
 }
 
 static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
@@ -246,25 +245,33 @@ 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);
+		goto err_unregister_i2c_clk;
 
 	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;
+
+	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 mfd_add_devices(&pdev->dev, 0, intel_quark_mfd_cells,
-			       ARRAY_SIZE(intel_quark_mfd_cells), NULL, 0,
-			       NULL);
+	return 0;
+
+err_unregister_i2c_clk:
+	intel_quark_unregister_i2c_clk(pdev);
+	return ret;
 }
 
 static void intel_quark_mfd_remove(struct pci_dev *pdev)
-- 
2.7.0