[ 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; }