When a set_timeout operation succeeds this does not necessarily mean that
the exact timeout requested has been achieved, because the watchdog does not
necessarily have a 1 second resolution. So rather then have the core set
the timeout member of the watchdog_device struct to the exact requested
value, instead the driver should set it to the actually achieved timeout value.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Documentation/watchdog/watchdog-kernel-api.txt | 7 ++++---
drivers/staging/mei/wd.c | 1 +
drivers/watchdog/s3c2410_wdt.c | 2 ++
drivers/watchdog/via_wdt.c | 1 +
drivers/watchdog/watchdog_dev.c | 2 --
drivers/watchdog/wm831x_wdt.c | 1 +
6 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index b43c40c..e7a7de1 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -136,9 +136,10 @@ they are supported. These optional routines/operations are:
status of the device is reported with watchdog WDIOF_* status flags/bits.
* set_timeout: this routine checks and changes the timeout of the watchdog
timer device. It returns 0 on success, -EINVAL for "parameter out of range"
- and -EIO for "could not write value to the watchdog". On success the timeout
- value of the watchdog_device will be changed to the value that was just used
- to re-program the watchdog timer device.
+ and -EIO for "could not write value to the watchdog". On success this
+ routine should set the timeout value of the watchdog_device to the
+ achieved timeout value (which may be different from the requested one
+ because the watchdog does not necessarily has a 1 second resolution).
(Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
watchdog's info structure).
* ioctl: if this routine is present then it will be called first before we do
diff --git a/drivers/staging/mei/wd.c b/drivers/staging/mei/wd.c
index 8094941..9503c32 100644
--- a/drivers/staging/mei/wd.c
+++ b/drivers/staging/mei/wd.c
@@ -326,6 +326,7 @@ static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int t
dev->wd_timeout = timeout;
mei_wd_set_start_timeout(dev, dev->wd_timeout);
+ wd_dev->timeout = dev->wd_timeout;
mutex_unlock(&dev->device_lock);
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 404172f..6ea79b0 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -200,6 +200,8 @@ static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeou
writel(count, wdt_base + S3C2410_WTDAT);
writel(wtcon, wdt_base + S3C2410_WTCON);
+ wdd->timeout = (count * divisor) / freq;
+
return 0;
}
diff --git a/drivers/watchdog/via_wdt.c b/drivers/watchdog/via_wdt.c
index 8f07dd4..47afe5b 100644
--- a/drivers/watchdog/via_wdt.c
+++ b/drivers/watchdog/via_wdt.c
@@ -126,6 +126,7 @@ static int wdt_set_timeout(struct watchdog_device *wdd,
{
writel(new_timeout, wdt_mem + VIA_WDT_COUNT);
timeout = new_timeout;
+ wdd->timeout = timeout;
return 0;
}
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 15dc3df..c8a594e 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -265,8 +265,6 @@ static int watchdog_set_timeout(struct watchdog_device *wddev,
}
ret = wddev->ops->set_timeout(wddev, timeout);
- if (ret == 0)
- wddev->timeout = timeout;
leave:
mutex_unlock(&wddev->lock);
return ret;
diff --git a/drivers/watchdog/wm831x_wdt.c b/drivers/watchdog/wm831x_wdt.c
index 263c883..8664ff1 100644
--- a/drivers/watchdog/wm831x_wdt.c
+++ b/drivers/watchdog/wm831x_wdt.c
@@ -157,6 +157,7 @@ static int wm831x_wdt_set_timeout(struct watchdog_device *wdt_dev,
ret = wm831x_set_bits(wm831x, WM831X_WATCHDOG,
WM831X_WDOG_TO_MASK,
wm831x_wdt_cfgs[i].val);
+ wdt_dev->timeout = timeout;
wm831x_reg_lock(wm831x);
} else {
dev_err(wm831x->dev, "Failed to unlock security key: %d\n",
--
1.7.9.3
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