tpm: fix the cleanup of struct tpm_chip

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@linux.intel.com>
cc: stable@vger.kernel.org
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 1a9dcee..2521425 100644 (file)
--- 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 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);
@@ -171,7 +173,7 @@ 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)