[PATCH v2 3/3] tpm: vtpm_proxy: Avoid reading host log when using a virtual device

Stefan Berger stefanb at linux.ibm.com
Wed Mar 10 22:19:16 UTC 2021

Avoid allocating memory and reading the host log when a virtual device
is used since this log is of no use to that driver. A virtual
device can be identified through the flag TPM_CHIP_FLAG_VIRTUAL, which
is only set for the tpm_vtpm_proxy driver.

Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs")
Signed-off-by: Stefan Berger <stefanb at linux.ibm.com>
 drivers/char/tpm/eventlog/common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/char/tpm/eventlog/common.c b/drivers/char/tpm/eventlog/common.c
index 7460f230bae4..8512ec76d526 100644
--- a/drivers/char/tpm/eventlog/common.c
+++ b/drivers/char/tpm/eventlog/common.c
@@ -107,6 +107,9 @@ void tpm_bios_log_setup(struct tpm_chip *chip)
 	int log_version;
 	int rc = 0;
+	if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
+		return;
 	rc = tpm_read_log(chip);
 	if (rc < 0)

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