gcc emits the following warning:
drivers/char/watchdog/iTCO_wdt.c: In function ‘iTCO_wdt_ioctl’:
drivers/char/watchdog/iTCO_wdt.c:429: warning: ‘time_left’ may be used uninitialized in this function
This indicates a condition near enough to a bug, to want to fix.
iTCO_wdt_get_timeleft() stores a value in 'time_left' iff
iTCO_version==(1 or 2). This driver only supports versions
1 or 2, so this is ok. However, since (a) the return value of
iTCO_wdt_get_timeleft() is handled anyway, (b) it fixes the warning,
and (c) it future-proofs the driver, we go ahead and add the obvious
return value.
Signed-off-by: Jeff Garzik <[email protected]>
---
drivers/char/watchdog/iTCO_wdt.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/char/watchdog/iTCO_wdt.c b/drivers/char/watchdog/iTCO_wdt.c
index aaac94d..bf5cd55 100644
--- a/drivers/char/watchdog/iTCO_wdt.c
+++ b/drivers/char/watchdog/iTCO_wdt.c
@@ -355,7 +355,8 @@ static int iTCO_wdt_get_timeleft (int *t
spin_unlock(&iTCO_wdt_private.io_lock);
*time_left = (val8 * 6) / 10;
- }
+ } else
+ return -EINVAL;
return 0;
}
@@ -426,7 +427,6 @@ static int iTCO_wdt_ioctl (struct inode
{
int new_options, retval = -EINVAL;
int new_heartbeat;
- int time_left;
void __user *argp = (void __user *)arg;
int __user *p = argp;
static struct watchdog_info ident = {
@@ -486,6 +486,8 @@ static int iTCO_wdt_ioctl (struct inode
case WDIOC_GETTIMELEFT:
{
+ int time_left;
+
if (iTCO_wdt_get_timeleft(&time_left))
return -EINVAL;
-
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