watchdog: msc313e: Fix clock leak and spurious timer in settimeout()

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msc313e_wdt_settimeout() unconditionally calls msc313e_wdt_start() which
introduces two severe bugs:

1. If the watchdog is already active, calling start() again will
   increase the reference count of the clock again.  However stop() is
   only called once, the reference count is unbalance.
2. If the watchdog is stopped, calling settimeout() will start
   the hardware timer accidentally.

Factor out the register-writing logic into a helper function.  Only call
it in settimeout() if the watchdog is running.  Otherwise, simply update
`wdev->timeout`.

Fixes: e9800b7994 ("watchdog: Add Mstar MSC313e WDT driver")
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://patch.msgid.link/20260828161348.13212-4-tzungbi@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

...

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Tzung-Bi Shih 2026-08-29 00:13:42 +08:00 • committed by Guenter Roeck

parent 3c73a37f5e

commit 3db30f3159

1 changed files with 16 additions and 6 deletions

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drivers/watchdog/msc313e_wdt.c

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