Add a return value check when reading data from the FIFO register.
This patch is commit id c4eadfafb91d5501095c55ffadaa1168743f39d3 backport to 3.19.
Reviewed-by: Jasob Gunthorpe <jason.gunthorpe@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christophe Ricard <christophe-h.ricard@xxxxxx>
Reviewed-by: Peter Huewe <peterhuewe@xxxxxx>
Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>
---
drivers/char/tpm/tpm_i2c_stm_st33.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 7d1c540..3f187a5 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -397,7 +397,7 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
*/
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
- int size = 0, burstcnt, len;
+ int size = 0, burstcnt, len, ret;
struct i2c_client *client;
client = (struct i2c_client *)TPM_VPRIV(chip);
@@ -406,13 +406,15 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
wait_for_stat(chip,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
chip->vendor.timeout_c,
- &chip->vendor.read_queue)
- == 0) {
+ &chip->vendor.read_queue) == 0) {
burstcnt = get_burstcount(chip);
if (burstcnt < 0)
return burstcnt;
len = min_t(int, burstcnt, count - size);
- I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+ ret = I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
+ if (ret < 0)
+ return ret;
+
size += len;
}
return size;
--
2.1.0
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