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authorRasmus Villemoes <rasmus.villemoes@prevas.dk>2019-06-05 17:06:43 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2019-07-08 21:04:13 +0300
commit487e4e08221debb1ccf9cb2c249fac379b74cbb2 (patch)
treef3d6d4c22f5debc716a315572b127bcf4835b6f9 /drivers/watchdog/watchdog_dev.c
parent4d1c6a0ec2d98e51f950127bf9299531caac53e1 (diff)
downloadlinux-487e4e08221debb1ccf9cb2c249fac379b74cbb2.tar.xz
watchdog: introduce CONFIG_WATCHDOG_OPEN_TIMEOUT
This allows setting a default value for the watchdog.open_timeout commandline parameter via Kconfig. Some BSPs allow remote updating of the kernel image and root file system, but updating the bootloader requires physical access. Hence, if one has a firmware update that requires relaxing the watchdog.open_timeout a little, the value used must be baked into the kernel image itself and cannot come from the u-boot environment via the kernel command line. Being able to set the initial value in .config doesn't change the fact that the value on the command line, if present, takes precedence, and is of course immensely useful for development purposes while one has console acccess, as well as usable in the cases where one can make a permanent update of the kernel command line. Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/watchdog_dev.c')
-rw-r--r--drivers/watchdog/watchdog_dev.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index e4b51db48f0e..334b810db2cf 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -88,7 +88,7 @@ static struct kthread_worker *watchdog_kworker;
static bool handle_boot_enabled =
IS_ENABLED(CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED);
-static unsigned open_timeout;
+static unsigned open_timeout = CONFIG_WATCHDOG_OPEN_TIMEOUT;
static bool watchdog_past_open_deadline(struct watchdog_core_data *data)
{
@@ -1214,4 +1214,5 @@ MODULE_PARM_DESC(handle_boot_enabled,
module_param(open_timeout, uint, 0644);
MODULE_PARM_DESC(open_timeout,
- "Maximum time (in seconds, 0 means infinity) for userspace to take over a running watchdog (default=0)");
+ "Maximum time (in seconds, 0 means infinity) for userspace to take over a running watchdog (default="
+ __MODULE_STRING(CONFIG_WATCHDOG_OPEN_TIMEOUT) ")");