[PATCH] tpm: fix (ACPI S3) suspend regression
Stefan Berger
68d6e6713fcb2ea6278661aaaf5f1c9c821b3751 and occurring with an Infineon
TPM and tpm_tis and tpm_infineon drivers active. Further, 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 <ste...@linux.vnet.ibm.com>
Tested-by: Rafael J. Wysocki <r...@sisk.pl>
---
drivers/char/tpm/tpm.c | 9 +++++++++
drivers/char/tpm/tpm.h | 3 +++
2 files changed, 12 insertions(+)
Index: linux-2.6/drivers/char/tpm/tpm.c
===================================================================
--- linux-2.6.orig/drivers/char/tpm/tpm.c
+++ linux-2.6/drivers/char/tpm/tpm.c
@@ -846,6 +846,15 @@ int tpm_do_selftest(struct tpm_chip *chi
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);
Index: linux-2.6/drivers/char/tpm/tpm.h
===================================================================
--- linux-2.6.orig/drivers/char/tpm/tpm.h
+++ linux-2.6/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 *);
--
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