[PATCH 4.19 86/96] tpm/tpm_i2c_atmel: Return -E2BIG when the transfer is incomplete

Greg Kroah-Hartman
2019-04-24T17:32:53Z

[ Upstream commit 442601e87a4769a8daba4976ec3afa5222ca211d ]

Return -E2BIG when the transfer is incomplete. The upper layer does
not retry, so not doing that is incorrect behaviour.

Cc: stable@vger.kernel.org
Fixes: a2871c62e186 ("tpm: Add support for Atmel I2C TPMs")
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/char/tpm/tpm_i2c_atmel.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
index 32a8e27c5382..cc4e642d3180 100644
--- a/drivers/char/tpm/tpm_i2c_atmel.c
+++ b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -69,6 +69,10 @@ static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len)
if (status < 0)
return status;

+ /* The upper layer does not support incomplete sends. */
+ if (status != len)
+ return -E2BIG;
+
return 0;
}

--
2.19.1