From: Jarkko Sakkinen jarkko@kernel.org
[ Upstream commit 0c8862de05c1a087795ee0a87bf61a6394306cc0 ]
TPM chip bootstrapping was removed from tpm_chip_register(), and it was relocated to tpm_tis_core. This breaks all drivers which are not based on tpm_tis because the chip will not get properly initialized.
Take the corrective steps: 1. Rename tpm_chip_startup() as tpm_chip_bootstrap() and make it one-shot. 2. Call tpm_chip_bootstrap() in tpm_chip_register(), which reverts the things as tehy used to be.
Cc: Lino Sanfilippo l.sanfilippo@kunbus.com Fixes: 548eb516ec0f ("tpm, tpm_tis: startup chip before testing for interrupts") Reported-by: Pengfei Xu pengfei.xu@intel.com Link: https://lore.kernel.org/all/ZEjqhwHWBnxcaRV5@xpf.sh.intel.com/ Tested-by: Pengfei Xu pengfei.xu@intel.com Signed-off-by: Jarkko Sakkinen jarkko@kernel.org Stable-dep-of: 99d464506255 ("tpm: Prevent hwrng from activating during resume") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/char/tpm/tpm-chip.c | 22 +++++++++++++++++++--- drivers/char/tpm/tpm.h | 2 +- drivers/char/tpm/tpm_tis_core.c | 2 +- include/linux/tpm.h | 13 +++++++------ 4 files changed, 28 insertions(+), 11 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 6fdfa65a00c37..9c0a6aad81140 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -606,13 +606,19 @@ static int tpm_get_pcr_allocation(struct tpm_chip *chip) }
/* - * tpm_chip_startup() - performs auto startup and allocates the PCRs + * tpm_chip_bootstrap() - Boostrap TPM chip after power on * @chip: TPM chip to use. + * + * Initialize TPM chip after power on. This a one-shot function: subsequent + * calls will have no effect. */ -int tpm_chip_startup(struct tpm_chip *chip) +int tpm_chip_bootstrap(struct tpm_chip *chip) { int rc;
+ if (chip->flags & TPM_CHIP_FLAG_BOOTSTRAPPED) + return 0; + rc = tpm_chip_start(chip); if (rc) return rc; @@ -625,9 +631,15 @@ int tpm_chip_startup(struct tpm_chip *chip) stop: tpm_chip_stop(chip);
+ /* + * Unconditionally set, as driver initialization should cease, when the + * boostrapping process fails. + */ + chip->flags |= TPM_CHIP_FLAG_BOOTSTRAPPED; + return rc; } -EXPORT_SYMBOL_GPL(tpm_chip_startup); +EXPORT_SYMBOL_GPL(tpm_chip_bootstrap);
/* * tpm_chip_register() - create a character device for the TPM chip @@ -644,6 +656,10 @@ int tpm_chip_register(struct tpm_chip *chip) { int rc;
+ rc = tpm_chip_bootstrap(chip); + if (rc) + return rc; + tpm_sysfs_add_device(chip);
tpm_bios_log_setup(chip); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 88d3bd76e0760..f6c99b3f00458 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -263,7 +263,7 @@ static inline void tpm_msleep(unsigned int delay_msec) delay_msec * 1000); };
-int tpm_chip_startup(struct tpm_chip *chip); +int tpm_chip_bootstrap(struct tpm_chip *chip); int tpm_chip_start(struct tpm_chip *chip); void tpm_chip_stop(struct tpm_chip *chip); struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip); diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index 9f76c9a5aa422..f02b583005a53 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -1125,7 +1125,7 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, init_waitqueue_head(&priv->read_queue); init_waitqueue_head(&priv->int_queue);
- rc = tpm_chip_startup(chip); + rc = tpm_chip_bootstrap(chip); if (rc) goto out_err;
diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 4dc97b9f65fb0..77693389c3f9a 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -274,13 +274,14 @@ enum tpm2_cc_attrs { #define TPM_VID_ATML 0x1114
enum tpm_chip_flags { - TPM_CHIP_FLAG_TPM2 = BIT(1), - TPM_CHIP_FLAG_IRQ = BIT(2), - TPM_CHIP_FLAG_VIRTUAL = BIT(3), - TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4), - TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), + TPM_CHIP_FLAG_BOOTSTRAPPED = BIT(0), + TPM_CHIP_FLAG_TPM2 = BIT(1), + TPM_CHIP_FLAG_IRQ = BIT(2), + TPM_CHIP_FLAG_VIRTUAL = BIT(3), + TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4), + TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5), TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6), - TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7), + TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7), };
#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)