Commit 0b944fce55f4 ("watchdog: permit `wd 0` for non-stoppable, but
inactive, watchdogs") silently broke use of non-stoppable, but inactive,
watchdogs altogether. Because those always had watchdog_hw_running
evaluating to false, it early exited without a chance to ever actually
set the timeout (and for watchdog_hw_running to evaluate to != false).
This results in following watchdog drivers being broken in v2020.08.0:
- imxwd
- f71808e_wdt
- at91sam9_wdt
Fixes: 0b944fce55f4 ("watchdog: permit `wd 0` for non-stoppable, but inactive, watchdogs")
Reported-by: Bastian Krause <bst@xxxxxxxxxxxxxx>
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
Please apply to master (and to v2020.08.1?).
---
drivers/watchdog/wd_core.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c
index ab1dcaa40a3a..4247288dbd0a 100644
--- a/drivers/watchdog/wd_core.c
+++ b/drivers/watchdog/wd_core.c
@@ -45,12 +45,11 @@ int watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
if (timeout > wd->timeout_max)
return -EINVAL;
- if (watchdog_hw_running(wd) == false)
- return 0;
-
pr_debug("setting timeout on %s to %ds\n", watchdog_name(wd), timeout);
ret = wd->set_timeout(wd, timeout);
+ if (ret == -ENOSYS && watchdog_hw_running(wd) == false)
+ return 0;
if (ret)
return ret;
--
2.28.0
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