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| author | Stefan Berger <stefanb@linux.vnet.ibm.com> | 2012-01-17 22:07:30 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-18 15:50:17 -0800 |
| commit | be405411f712489f2f780ab085e1069e8fb85f19 (patch) | |
| tree | 39816de2c022f940cfeb6bd3218f9346b91f31f7 /drivers/char | |
| parent | 93c3d65b28bab6da520c2add9cb387a0303f8b2d (diff) | |
| download | linux-be405411f712489f2f780ab085e1069e8fb85f19.tar.gz linux-be405411f712489f2f780ab085e1069e8fb85f19.tar.bz2 linux-be405411f712489f2f780ab085e1069e8fb85f19.zip | |
tpm: fix (ACPI S3) suspend regression
This patch fixes an (ACPI S3) suspend regression introduced in commit
68d6e6713fcb ("tpm: Introduce function to poll for result of self test")
and occurring with an Infineon TPM and tpm_tis and tpm_infineon drivers
active.
The suspend problem occurred if the TPM was disabled and/or deactivated
and therefore the TPM_PCRRead checking the result of the (asynchronous)
self test returned an error code which then caused the tpm_tis driver to
become inactive and this then seemed to have negatively influenced the
suspend support by the tpm_infineon driver... Besides that the tpm_tis
drive may stay active even if the TPM is disabled and/or deactivated.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 9 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 3 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 6a8771f47a55..32362cf35b8d 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -846,6 +846,15 @@ int tpm_do_selftest(struct tpm_chip *chip) do { rc = __tpm_pcr_read(chip, 0, digest); + if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) { + dev_info(chip->dev, + "TPM is disabled/deactivated (0x%X)\n", rc); + /* TPM is disabled and/or deactivated; driver can + * proceed and TPM does handle commands for + * suspend/resume correctly + */ + return 0; + } if (rc != TPM_WARN_DOING_SELFTEST) return rc; msleep(delay_msec); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 8c1df302fbb6..010547138281 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -39,6 +39,9 @@ enum tpm_addr { }; #define TPM_WARN_DOING_SELFTEST 0x802 +#define TPM_ERR_DEACTIVATED 0x6 +#define TPM_ERR_DISABLED 0x7 + #define TPM_HEADER_SIZE 10 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, char *); |