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tpm: Fix initialization of the cdev 

When a cdev is contained in a dynamic structure the cdev parent kobj
should be set to the kobj that controls the lifetime of the enclosing
structure. In TPM's case this is the embedded struct device.

Also, cdev_init 0's the whole structure, so all sets must be after,
not before. This fixes module ref counting and cdev.

Cc: <stable@vger.kernel.org>
Fixes: 313d21eeab ("tpm: device class for tpm")
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
hifive-unleashed-5.1
Jason Gunthorpe 2015-06-30 13:15:31 -06:00 committed by Peter Huewe
parent b3bddffd35
commit ba0ef85479
1 changed files with 2 additions and 1 deletions
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3
drivers/char/tpm/tpm-chip.c
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@ -129,8 +129,9 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
device_initialize(&chip->dev);
chip->cdev.owner = chip->pdev->driver->owner;
cdev_init(&chip->cdev, &tpm_fops);
chip->cdev.owner = chip->pdev->driver->owner;
chip->cdev.kobj.parent = &chip->dev.kobj;
return chip;
}