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authorAndrey Smirnov <andrew.smirnov@gmail.com>2019-08-12 13:08:51 -0700
committerWim Van Sebroeck <wim@linux-watchdog.org>2019-09-17 08:59:05 +0200
commit08188e8dbc7587d58948efca493219515d6a5639 (patch)
treeaeed008b9584eebc5a23c1e47951f13b7ca1135f /drivers/watchdog/ziirave_wdt.c
parent5870f4958ccf90f4cdf3911bade77cb72a3bf28c (diff)
downloadlinux-08188e8dbc7587d58948efca493219515d6a5639.tar.bz2
watchdog: ziirave_wdt: Check packet length only once
We don't need to check for packet length more than once, so drop the extra check in ziirave_firm_upload(). While at it move the check at the very start of __ziirave_firm_write_pkt(), as to not waste any time preparing a packet we'll never use. 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/20190812200906.31344-8-andrew.smirnov@gmail.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/ziirave_wdt.c')
-rw-r--r--drivers/watchdog/ziirave_wdt.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index b2d5ff0c22fe..9d9c669b8b47 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -253,6 +253,13 @@ static int __ziirave_firm_write_pkt(struct watchdog_device *wdd,
u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE];
int ret;
+ /* Check max data size */
+ if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
+ dev_err(&client->dev, "Firmware packet too long (%d)\n",
+ len);
+ return -EMSGSIZE;
+ }
+
memset(packet, 0, ARRAY_SIZE(packet));
/* Packet length */
@@ -261,9 +268,6 @@ static int __ziirave_firm_write_pkt(struct watchdog_device *wdd,
packet[1] = addr16 & 0xff;
packet[2] = (addr16 & 0xff00) >> 8;
- /* Packet data */
- if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE)
- return -EMSGSIZE;
memcpy(packet + 3, data, len);
/* Packet checksum */
@@ -382,13 +386,6 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
if (!be16_to_cpu(rec->len))
break;
- /* Check max data size */
- if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
- dev_err(&client->dev, "Firmware packet too long (%d)\n",
- be16_to_cpu(rec->len));
- return -EMSGSIZE;
- }
-
ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr),
rec->data, be16_to_cpu(rec->len));
if (ret)