[PATCH v2 3/5] char: tpm: rewrite "tpm_tis_req_canceled()"
From: <hidden>
Date: 2019-12-02 13:34:47
Also in:
linux-integrity, lkml
Subsystem:
the rest, tpm device driver · Maintainers:
Linus Torvalds, Peter Huewe, Jarkko Sakkinen
From: Amir Mizinski <redacted> Using this function while read/write data resulted in aborted operation. After investigating according to TCG TPM Profile (PTP) Specifications, i found cancel should happen only if TPM_STS.commandReady bit is lit and couldn't find a case when the current condition is valid. Also only cmdReady bit need to be compared instead of the full lower status register byte. Signed-off-by: Amir Mizinski <redacted> --- drivers/char/tpm/tpm_tis_core.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index 43784fd..924489c 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c@@ -631,17 +631,7 @@ static int probe_itpm(struct tpm_chip *chip) static bool tpm_tis_req_canceled(struct tpm_chip *chip, u8 status) { - struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev); - - switch (priv->manufacturer_id) { - case TPM_VID_WINBOND: - return ((status == TPM_STS_VALID) || - (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY))); - case TPM_VID_STM: - return (status == (TPM_STS_VALID | TPM_STS_COMMAND_READY)); - default: - return (status == TPM_STS_COMMAND_READY); - } + return ((status & TPM_STS_COMMAND_READY) == TPM_STS_COMMAND_READY); } static irqreturn_t tis_int_handler(int dummy, void *dev_id)
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2.7.4