[PATCH v2 06/10] tpm/tpm_i2c_stm_st33: Add status check when reading data on the FIFO

[Christophe Ricard]

Add a return value check when reading data from the FIFO register.

Reviewed-by: Jasob Gunthorpe <jason.guntho...@obsidianresearch.com>
Signed-off-by: Christophe Ricard <christophe-h.ric...@st.com>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c 
b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 3289f9d..eeb4816 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -440,7 +440,7 @@ again:
  */
 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 tpm_stm_dev *tpm_dev;
 
        tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
@@ -454,7 +454,10 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, 
size_t count)
                if (burstcnt < 0)
                        return burstcnt;
                len = min_t(int, burstcnt, count - size);
-               I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
+               ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
+               if (ret < 0)
+                       return ret;
+
                size += len;
        }
        return size;
-- 
2.1.0

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