diff options
Diffstat (limited to 'drivers/char/tpm/tpm_tis.c')
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index a1748621111b..d2a70cae76df 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -76,7 +76,7 @@ enum tis_defaults { #define TPM_RID(l) (0x0F04 | ((l) << 12)) static LIST_HEAD(tis_chips); -static DEFINE_SPINLOCK(tis_lock); +static DEFINE_MUTEX(tis_lock); #if defined(CONFIG_PNP) && defined(CONFIG_ACPI) static int is_itpm(struct pnp_dev *dev) @@ -367,7 +367,12 @@ static int probe_itpm(struct tpm_chip *chip) 0x00, 0x00, 0x00, 0xf1 }; size_t len = sizeof(cmd_getticks); - int rem_itpm = itpm; + bool rem_itpm = itpm; + u16 vendor = ioread16(chip->vendor.iobase + TPM_DID_VID(0)); + + /* probe only iTPMS */ + if (vendor != TPM_VID_INTEL) + return 0; itpm = 0; @@ -390,9 +395,6 @@ static int probe_itpm(struct tpm_chip *chip) out: itpm = rem_itpm; tpm_tis_ready(chip); - /* some TPMs need a break here otherwise they will not work - * correctly on the immediately subsequent command */ - msleep(chip->vendor.timeout_b); release_locality(chip, chip->vendor.locality, 0); return rc; @@ -508,7 +510,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, resource_size_t len, unsigned int irq) { u32 vendor, intfcaps, intmask; - int rc, i, irq_s, irq_e; + int rc, i, irq_s, irq_e, probe; struct tpm_chip *chip; if (!(chip = tpm_register_hardware(dev, &tpm_tis))) @@ -538,11 +540,12 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0))); if (!itpm) { - itpm = probe_itpm(chip); - if (itpm < 0) { + probe = probe_itpm(chip); + if (probe < 0) { rc = -ENODEV; goto out_err; } + itpm = (probe == 0) ? 0 : 1; } if (itpm) @@ -689,9 +692,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start, } INIT_LIST_HEAD(&chip->vendor.list); - spin_lock(&tis_lock); + mutex_lock(&tis_lock); list_add(&chip->vendor.list, &tis_chips); - spin_unlock(&tis_lock); + mutex_unlock(&tis_lock); return 0; @@ -855,7 +858,7 @@ static void __exit cleanup_tis(void) { struct tpm_vendor_specific *i, *j; struct tpm_chip *chip; - spin_lock(&tis_lock); + mutex_lock(&tis_lock); list_for_each_entry_safe(i, j, &tis_chips, list) { chip = to_tpm_chip(i); tpm_remove_hardware(chip->dev); @@ -871,7 +874,7 @@ static void __exit cleanup_tis(void) iounmap(i->iobase); list_del(&i->list); } - spin_unlock(&tis_lock); + mutex_unlock(&tis_lock); #ifdef CONFIG_PNP if (!force) { pnp_unregister_driver(&tis_pnp_driver); |