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>

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 4838c6a..3d6d394 100644 (file)
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -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)
 {

diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index d9caedd..edfa891 100644 (file)
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -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;
 }