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path: root/drivers/char/tpm
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Diffstat (limited to 'drivers/char/tpm')
-rw-r--r--drivers/char/tpm/tpm.c44
-rw-r--r--drivers/char/tpm/tpm.h2
2 files changed, 29 insertions, 17 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index c88424a0c89b..a5d8bcb40000 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1031,18 +1031,13 @@ void tpm_remove_hardware(struct device *dev)
spin_unlock(&driver_lock);
- dev_set_drvdata(dev, NULL);
misc_deregister(&chip->vendor.miscdev);
- kfree(chip->vendor.miscdev.name);
sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
tpm_bios_log_teardown(chip->bios_dir);
- clear_bit(chip->dev_num, dev_mask);
-
- kfree(chip);
-
- put_device(dev);
+ /* write it this way to be explicit (chip->dev == dev) */
+ put_device(chip->dev);
}
EXPORT_SYMBOL_GPL(tpm_remove_hardware);
@@ -1083,6 +1078,26 @@ int tpm_pm_resume(struct device *dev)
EXPORT_SYMBOL_GPL(tpm_pm_resume);
/*
+ * Once all references to platform device are down to 0,
+ * release all allocated structures.
+ * In case vendor provided release function,
+ * call it too.
+ */
+static void tpm_dev_release(struct device *dev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+
+ if (chip->vendor.release)
+ chip->vendor.release(dev);
+
+ chip->release(dev);
+
+ clear_bit(chip->dev_num, dev_mask);
+ kfree(chip->vendor.miscdev.name);
+ kfree(chip);
+}
+
+/*
* Called from tpm_<specific>.c probe function only for devices
* the driver has determined it should claim. Prior to calling
* this function the specific probe function has called pci_enable_device
@@ -1136,23 +1151,21 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend
chip->vendor.miscdev.parent = dev;
chip->dev = get_device(dev);
+ chip->release = dev->release;
+ dev->release = tpm_dev_release;
+ dev_set_drvdata(dev, chip);
if (misc_register(&chip->vendor.miscdev)) {
dev_err(chip->dev,
"unable to misc_register %s, minor %d\n",
chip->vendor.miscdev.name,
chip->vendor.miscdev.minor);
- put_device(dev);
- clear_bit(chip->dev_num, dev_mask);
- kfree(chip);
- kfree(devname);
+ put_device(chip->dev);
return NULL;
}
spin_lock(&driver_lock);
- dev_set_drvdata(dev, chip);
-
list_add(&chip->list, &tpm_chip_list);
spin_unlock(&driver_lock);
@@ -1160,10 +1173,7 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend
if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
list_del(&chip->list);
misc_deregister(&chip->vendor.miscdev);
- put_device(dev);
- clear_bit(chip->dev_num, dev_mask);
- kfree(chip);
- kfree(devname);
+ put_device(chip->dev);
return NULL;
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index d15ccddc92eb..e885148b4cfb 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -74,6 +74,7 @@ struct tpm_vendor_specific {
int (*send) (struct tpm_chip *, u8 *, size_t);
void (*cancel) (struct tpm_chip *);
u8 (*status) (struct tpm_chip *);
+ void (*release) (struct device *);
struct miscdevice miscdev;
struct attribute_group *attr_group;
struct list_head list;
@@ -106,6 +107,7 @@ struct tpm_chip {
struct dentry **bios_dir;
struct list_head list;
+ void (*release) (struct device *);
};
#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)