[4.2.y-ckt stable] Patch "mfd: intel_quark_i2c_gpio: Remove clock tree on error path" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mfd: intel_quark_i2c_gpio: Remove clock tree on error path

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt12.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From cf491c6c6d1124c739dce6e674b6e09df6fc8d37 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
Date: Fri, 19 Feb 2016 10:42:10 +0200
Subject: mfd: intel_quark_i2c_gpio: Remove clock tree on error path

commit 7f0c5ae18d649ed2f4978cbf07c02a0ff732f23e upstream.

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 at linux.intel.com>
Acked-by: Stephen Boyd <sboyd at codeaurora.org>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 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 cbbf84b..340ff40 100644
--- a/drivers/mfd/intel_quark_i2c_gpio.c
+++ b/drivers/mfd/intel_quark_i2c_gpio.c
@@ -125,6 +125,7 @@ static int intel_quark_register_i2c_clk(struct intel_quark_mfd *quark_mfd)
 						INTEL_QUARK_I2C_CONTROLLER_CLK);

 	if (!quark_mfd->i2c_clk_lookup) {
+		clk_unregister(quark_mfd->i2c_clk);
 		dev_err(&pdev->dev, "Fixed clk register failed\n");
 		return -ENOMEM;
 	}
@@ -136,7 +137,7 @@ 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);
@@ -232,26 +233,34 @@ 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[MFD_I2C_BAR]);
 	if (ret)
-		return ret;
+		goto err_unregister_i2c_clk;

 	ret = intel_quark_gpio_setup(pdev,
 				     &intel_quark_mfd_cells[MFD_GPIO_BAR]);
 	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)
--
2.7.4