diff mbox

[tpmdd-devel,v2,06/10] tpm/tpm_i2c_stm_st33: Add status check when reading data on the FIFO

Message ID 1421187198-8503-7-git-send-email-christophe-h.ricard@st.com
State Accepted, archived
Headers show

Commit Message

Christophe Ricard Jan. 13, 2015, 10:13 p.m. UTC 
Add a return value check when reading data from the FIFO register.

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

Patch

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;