linux-kernel - [PATCH 4.4 087/210] tpm: fix the cleanup of struct tpm

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Date:	Sun, 10 Apr 2016 11:35:08 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: [PATCH 4.4 087/210] tpm: fix the cleanup of struct tpm_chip

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

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@...ux.intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/char/tpm/tpm-chip.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -136,6 +136,8 @@ struct tpm_chip *tpmm_chip_alloc(struct
 	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);
@@ -171,7 +173,7 @@ static int tpm_add_char_device(struct tp
 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)