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Commit 6aa4ef4d authored by Peter Huewe's avatar Peter Huewe Committed by Kent Yoder
Browse files

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



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: default avatarPeter Huewe <peterhuewe@gmx.de>
Signed-off-by: default avatarKent Yoder <key@linux.vnet.ibm.com>
parent 21dc02ea

drivers/char/tpm/tpm_i2c_infineon.c

+9 −0
Original line number Diff line number Diff line
@@ -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;