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watchdog: ziirave_wdt: Skip zeros when calculating checksum

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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@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rick Ramstetter <rick@anteaterllc.com>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190812200906.31344-9-andrew.smirnov@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Andrey Smirnov 2019-08-12 13:08:52 -07:00 committed by Wim Van Sebroeck
parent 08188e8dbc
commit dc0dd28951
1 changed files with 1 additions and 1 deletions
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2
drivers/watchdog/ziirave_wdt.c
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@ -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;