[4.2.y-ckt stable] Patch "tpm: fix the cleanup of struct tpm_chip" 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

    tpm: fix the cleanup of struct tpm_chip

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

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt7.

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 3becc97a77b6b997fee3f26850bd588dacee9b1c Mon Sep 17 00:00:00 2001
From: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Date: Mon, 8 Feb 2016 22:31:08 +0200
Subject: tpm: fix the cleanup of struct tpm_chip

commit 8e0ee3c9faed7ca68807ea45141775856c438ac0 upstream.

If the initialization fails before tpm_chip_register(), put_device()
will be not called, which causes release callback not to be called.
This patch fixes the issue by adding put_device() to devres list of
the parent device.

Fixes: 313d21eeab ("tpm: device class for tpm")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe at obsidianresearch.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/char/tpm/tpm-chip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 86194a6..4a3e534 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -133,6 +133,8 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
 	chip->cdev.owner = chip->pdev->driver->owner;
 	chip->cdev.kobj.parent = &chip->dev.kobj;

+	devm_add_action(dev, (void (*)(void *)) put_device, &chip->dev);
+
 	return chip;
 }
 EXPORT_SYMBOL_GPL(tpmm_chip_alloc);
@@ -168,7 +170,7 @@ static int tpm_add_char_device(struct tpm_chip *chip)
 static void tpm_del_char_device(struct tpm_chip *chip)
 {
 	cdev_del(&chip->cdev);
-	device_unregister(&chip->dev);
+	device_del(&chip->dev);
 }

 static int tpm1_chip_register(struct tpm_chip *chip)
--
2.7.4