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

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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.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
This commit is contained in:
Peter Huewe 2013-03-04 22:17:15 +01:00 committed by Kent Yoder
parent 21dc02eab9
commit 6aa4ef4dab
1 changed files with 9 additions and 0 deletions
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9
drivers/char/tpm/tpm_i2c_infineon.c
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@ -162,6 +162,10 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
/* 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;