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watchdog: menz069_wdt: fix watchdog initialisation 

[ Upstream commit 87b22656ca ]

Doing a 'cat /dev/watchdog0' with menz069_wdt as watchdog0 will result in
a NULL pointer dereference.

This happens because we're passing the wrong pointer to
watchdog_register_device(). Fix this by getting rid of the static
watchdog_device structure and use the one embedded into the driver's
per-instance private data.

Signed-off-by: Johannes Thumshirn <jth@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230418172531.177349-2-jth@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Thumshirn 2023-04-18 19:25:30 +02:00 committed by Greg Kroah-Hartman
parent 787e74b213
commit 867dae5547
1 changed files with 6 additions and 10 deletions
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16
drivers/watchdog/menz69_wdt.c
View File

@ -98,14 +98,6 @@ static const struct watchdog_ops men_z069_ops = {
.set_timeout = men_z069_wdt_set_timeout,
};
static struct watchdog_device men_z069_wdt = {
.info = &men_z069_info,
.ops = &men_z069_ops,
.timeout = MEN_Z069_DEFAULT_TIMEOUT,
.min_timeout = 1,
.max_timeout = MEN_Z069_WDT_COUNTER_MAX / MEN_Z069_TIMER_FREQ,
};
static int men_z069_probe(struct mcb_device *dev,
const struct mcb_device_id *id)
{
@ -125,15 +117,19 @@ static int men_z069_probe(struct mcb_device *dev,
goto release_mem;
drv->mem = mem;
drv->wdt.info = &men_z069_info;
drv->wdt.ops = &men_z069_ops;
drv->wdt.timeout = MEN_Z069_DEFAULT_TIMEOUT;
drv->wdt.min_timeout = 1;
drv->wdt.max_timeout = MEN_Z069_WDT_COUNTER_MAX / MEN_Z069_TIMER_FREQ;
drv->wdt = men_z069_wdt;
watchdog_init_timeout(&drv->wdt, 0, &dev->dev);
watchdog_set_nowayout(&drv->wdt, nowayout);
watchdog_set_drvdata(&drv->wdt, drv);
drv->wdt.parent = &dev->dev;
mcb_set_drvdata(dev, drv);
return watchdog_register_device(&men_z069_wdt);
return watchdog_register_device(&drv->wdt);
release_mem:
mcb_release_mem(mem);