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tpm: Remove a deprecated comments about implicit sysfs locking 

Remove all comments about implicit locking tpm-sysfs.c as the file was
updated in Linux v5.1 to use explicit locking.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Jarkko Sakkinen 2019-07-08 17:56:39 +03:00
parent 1ea32c83c6
commit 28eba2fddd
2 changed files with 2 additions and 12 deletions
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7
drivers/char/tpm/tpm-chip.c
View File

@ -287,12 +287,9 @@ static void tpm_devs_release(struct device *dev)
* @dev: device to which the chip is associated.
*
* Issues a TPM2_Shutdown command prior to loss of power, as required by the
* TPM 2.0 spec.
* Then, calls bus- and device- specific shutdown code.
* TPM 2.0 spec. Then, calls bus- and device- specific shutdown code.
*
* XXX: This codepath relies on the fact that sysfs is not enabled for
* TPM2: sysfs uses an implicit lock on chip->ops, so this could race if TPM2
* has sysfs support enabled before TPM sysfs's implicit locking is fixed.
* Return: always 0 (i.e. success)
*/
static int tpm_class_shutdown(struct device *dev)
{

7
drivers/char/tpm/tpm-sysfs.c
View File

@ -329,16 +329,9 @@ static const struct attribute_group tpm_dev_group = {
void tpm_sysfs_add_device(struct tpm_chip *chip)
{
/* XXX: If you wish to remove this restriction, you must first update
* tpm_sysfs to explicitly lock chip->ops.
*/
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return;
/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
* is called before ops is null'd and the sysfs core synchronizes this
* removal so that no callbacks are running or can run again
*/
WARN_ON(chip->groups_cnt != 0);
chip->groups[chip->groups_cnt++] = &tpm_dev_group;
}