Patch "watchdog: menz069_wdt: fix watchdog initialisation" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    watchdog: menz069_wdt: fix watchdog initialisation

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     watchdog-menz069_wdt-fix-watchdog-initialisation.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 5a5575a3db9c170d17e37a002ec977b328fe32ed
Author: Johannes Thumshirn <jth@xxxxxxxxxx>
Date:   Tue Apr 18 19:25:30 2023 +0200

    watchdog: menz069_wdt: fix watchdog initialisation
    
    [ Upstream commit 87b22656ca6a896d0378e9e60ffccb0c82f48b08 ]
    
    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@xxxxxxxxxx>
    Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230418172531.177349-2-jth@xxxxxxxxxx
    Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
    Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/watchdog/menz69_wdt.c b/drivers/watchdog/menz69_wdt.c
index 8973f98bc6a56..bca0938f3429f 100644
--- a/drivers/watchdog/menz69_wdt.c
+++ b/drivers/watchdog/menz69_wdt.c
@@ -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);



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