On 2/7/19 8:51 PM, Stefan Berger wrote:
On 2/7/19 7:33 PM, Jarkko Sakkinen wrote:
On Thu, Feb 07, 2019 at 06:29:43PM -0500, Stefan Berger wrote:
On 2/7/19 4:29 PM, Jarkko Sakkinen wrote:
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index e74c5b7b64bf..52afe20cc8a1 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -799,7 +799,9 @@ int tpm2_probe(struct tpm_chip *chip)
tpm_buf_append_u32(&buf, TPM2_CAP_TPM_PROPERTIES);
tpm_buf_append_u32(&buf, TPM_PT_TOTAL_COMMANDS);
tpm_buf_append_u32(&buf, 1);
+ tpm_chip_start(chip);
rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
+ tpm_chip_stop(chip);
Thanks Stefan! I added call to tpm_tis_core as tpm2-cmd.c is to be kept
out of chip management common case being that you call
tpm_try_get_ops(),
do 1-N TPM commands and release with tpm_put_ops(). These functions take
care starting and stopping the chip.
I fixed the 2nd issue in the master.
You also need to export the tpm_chip_start/stop symbols.
Master now seems to (still) have a problem when rmmod'ing:
A TPM error (325) occurred stopping the TPM. This happens at the same
patch where I had to add the tpm_chip_start/stop above.
Here's my current overall patch against your master. I suppose the other
tpm2_shutdown() for power management doesn't need the chip start ?
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 9865776ee2cd..f7147706a9c3 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -115,6 +115,7 @@ int tpm_chip_start(struct tpm_chip *chip)
return 0;
}
+EXPORT_SYMBOL_GPL(tpm_chip_start);
/**
* tpm_chip_stop() - power off the TPM
@@ -131,7 +132,7 @@ void tpm_chip_stop(struct tpm_chip *chip)
if (chip->ops->clk_enable)
chip->ops->clk_enable(chip, false);
}
-
+EXPORT_SYMBOL_GPL(tpm_chip_stop);
/**
* tpm_try_get_ops() - Get a ref to the tpm_chip
@@ -474,8 +475,11 @@ static void tpm_del_char_device(struct tpm_chip *chip)
/* Make the driver uncallable. */
down_write(&chip->ops_sem);
- if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ tpm_chip_start(chip, 0);
tpm2_shutdown(chip, TPM2_SU_CLEAR);
+ tpm_chip_stop(chip, 0);
+ }
chip->ops = NULL;
up_write(&chip->ops_sem);
}
diff --git a/drivers/char/tpm/tpm-interface.c
b/drivers/char/tpm/tpm-interface.c
index 02e8cffd1163..fcd845ad8c3c 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -124,6 +124,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip
*chip, void *buf, size_t bufsiz)
dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
} else if (len < TPM_HEADER_SIZE || len !=
be32_to_cpu(header->length))
rc = -EFAULT;
+ else
+ rc = 0;
return rc ? rc : len;
}
/Jarkko
