Re: [PATCH] tpm: Fix kexec crash due to access to ops NULL pointer (powerpc)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index ddaeceb7e109..4cb908349b31 100644
+++ b/drivers/char/tpm/tpm-chip.c

@@ -473,15 +473,8 @@ static void tpm_del_char_device(struct tpm_chip *chip)

        mutex_unlock(&idr_lock);

        /* Make the driver uncallable. */
-       down_write(&chip->ops_sem);
-       if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-               if (!tpm_chip_start(chip)) {
-                       tpm2_shutdown(chip, TPM2_SU_CLEAR);
-                       tpm_chip_stop(chip);
-               }
-       }
-       chip->ops = NULL;
-       up_write(&chip->ops_sem);
+       if (chip->ops)