[PATCH] tpm/tpm_i2c_infineon: Add small comment about return value of __i2c_transfer

[Peter Huewe]

Kent Yoder indicated that the code might be a bit clearer with a comment
here, so this patch adds a small explanation of the code.

CC: Kent Yoder <shpedoikal@xxxxxxxxx>
Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>
---
 drivers/char/tpm/tpm_i2c_infineon.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
index d83bb8c..37d5dcc 100644
--- a/drivers/char/tpm/tpm_i2c_infineon.c
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -162,6 +162,10 @@ out:
 	/* take care of 'guard time' */
 	usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
 
+	/* __i2c_transfer returns the number of successfully transferred
+	 * messages.
+	 * So rc should be greater than 0 here otherwise we have an error.
+	 */
 	if (rc <= 0)
 		return -EIO;
 
@@ -208,6 +212,11 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
 	i2c_unlock_adapter(tpm_dev.client->adapter);
 	/* take care of 'guard time' */
 	usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+
+	/* __i2c_transfer returns the number of successfully transferred
+	 * messages.
+	 * So rc should be greater than 0 here otherwise we have an error.
+	 */
 	if (rc <= 0)
 		return -EIO;
 
-- 
1.7.12.4

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