[PATCH v2 08/22] watchdog: ziirave_wdt: Skip zeros when calculating checksum

[Andrey Smirnov]

Zeros don't contribute anything to checksum value, so we can skip
unused portion of the packet when calculating its checksum.

Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Cc: Chris Healy <cphealy@xxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Rick Ramstetter <rick@xxxxxxxxxxxxxxx>
Cc: linux-watchdog@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/watchdog/ziirave_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index 9d9c669b8b47..19da0910c2d1 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -271,7 +271,7 @@ static int __ziirave_firm_write_pkt(struct watchdog_device *wdd,
 	memcpy(packet + 3, data, len);
 
 	/* Packet checksum */
-	for (i = 0; i < ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1; i++)
+	for (i = 0; i < len + 3; i++)
 		checksum += packet[i];
 	packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;
 
-- 
2.21.0