From f7ea8a3bd52da9670d32fd9869657a8501edff23 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Tue, 30 Jun 2015 13:15:31 -0600 Subject: [PATCH] tpm: Fix initialization of the cdev commit ba0ef85479c46a2ab354c2220bdb6152f7f4baf3 upstream. 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. Fixes: 313d21eeab92 ("tpm: device class for tpm") Signed-off-by: Jason Gunthorpe Reviewed-by: Dmitry Torokhov Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Peter Huewe Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/tpm-chip.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 283f00a..1082d4b 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -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; } -- 2.7.4