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-rw-r--r--drivers/char/tpm/tpm.c22
1 files changed, 10 insertions, 12 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 05ad4a17a28f..7c4133582dba 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -47,6 +47,16 @@ enum tpm_duration {
47#define TPM_MAX_PROTECTED_ORDINAL 12 47#define TPM_MAX_PROTECTED_ORDINAL 12
48#define TPM_PROTECTED_ORDINAL_MASK 0xFF 48#define TPM_PROTECTED_ORDINAL_MASK 0xFF
49 49
50/*
51 * Bug workaround - some TPM's don't flush the most
52 * recently changed pcr on suspend, so force the flush
53 * with an extend to the selected _unused_ non-volatile pcr.
54 */
55static int tpm_suspend_pcr;
56module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
57MODULE_PARM_DESC(suspend_pcr,
58 "PCR to use for dummy writes to faciltate flush on suspend.");
59
50static LIST_HEAD(tpm_chip_list); 60static LIST_HEAD(tpm_chip_list);
51static DEFINE_SPINLOCK(driver_lock); 61static DEFINE_SPINLOCK(driver_lock);
52static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); 62static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
@@ -1077,18 +1087,6 @@ static struct tpm_input_header savestate_header = {
1077 .ordinal = TPM_ORD_SAVESTATE 1087 .ordinal = TPM_ORD_SAVESTATE
1078}; 1088};
1079 1089
1080/* Bug workaround - some TPM's don't flush the most
1081 * recently changed pcr on suspend, so force the flush
1082 * with an extend to the selected _unused_ non-volatile pcr.
1083 */
1084static int tpm_suspend_pcr;
1085static int __init tpm_suspend_setup(char *str)
1086{
1087 get_option(&str, &tpm_suspend_pcr);
1088 return 1;
1089}
1090__setup("tpm_suspend_pcr=", tpm_suspend_setup);
1091
1092/* 1090/*
1093 * We are about to suspend. Save the TPM state 1091 * We are about to suspend. Save the TPM state
1094 * so that it can be restored. 1092 * so that it can be restored.