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charset="utf-8" From: "Daniel P. Smith" The function tpm_tis_request_locality() is expected to return the locality value that was requested, or a negative error code upon failure. If it is c= alled while locality_count of struct tis_data is non-zero, no actual locality req= uest will be sent. Because the ret variable is initially set to 0, the locality_count will still get increased, and the function will return 0. Fo= r a caller, this would indicate that locality 0 was successfully requested and = not the state changes just mentioned. Additionally, the function __tpm_tis_request_locality() provides inconsiste= nt error codes. It will provide either a failed IO write or a -1 should it have timed out waiting for locality request to succeed. This commit changes __tpm_tis_request_locality() to return valid negative e= rror codes to reflect the reason it fails. It then adjusts the return value chec= k in tpm_tis_request_locality() to check for a non-negative return value before incrementing locality_cout. In addition, the initial value of the ret value= is set to a negative error to ensure the check does not pass if __tpm_tis_request_locality() is not called. Signed-off-by: Daniel P. Smith Signed-off-by: Ross Philipson --- drivers/char/tpm/tpm_tis_core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_cor= e.c index 22ebf679ea69..20a8b341be0d 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -210,7 +210,7 @@ static int __tpm_tis_request_locality(struct tpm_chip *= chip, int l) again: timeout =3D stop - jiffies; if ((long)timeout <=3D 0) - return -1; + return -EBUSY; rc =3D wait_event_interruptible_timeout(priv->int_queue, (check_locality (chip, l)), @@ -229,18 +229,21 @@ static int __tpm_tis_request_locality(struct tpm_chip= *chip, int l) tpm_msleep(TPM_TIMEOUT); } while (time_before(jiffies, stop)); } - return -1; + return -EBUSY; } =20 static int tpm_tis_request_locality(struct tpm_chip *chip, int l) { struct tpm_tis_data *priv =3D dev_get_drvdata(&chip->dev); - int ret =3D 0; + int ret =3D -EBUSY; + + if (l < 0 || l > TPM_MAX_LOCALITY) + return -EINVAL; =20 mutex_lock(&priv->locality_count_mutex); if (priv->locality_count =3D=3D 0) ret =3D __tpm_tis_request_locality(chip, l); - if (!ret) + if (ret >=3D 0) priv->locality_count++; mutex_unlock(&priv->locality_count_mutex); return ret; --=20 2.39.3