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Mon, 14 Sep 2026 05:36:16 -0700 (PDT) Received: from SGN-LDSENG.tasernet.com ([2405:4800:5cc3:11a:1ac0:4dff:fe8b:4a69]) by smtp.gmail.com with ESMTPSA id 5614622812f47-4c3315b19afsm10256886b6e.10.2026.09.14.05.36.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2026 05:36:16 -0700 (PDT) From: Cong Nguyen To: Wim Van Sebroeck Cc: Guenter Roeck , linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] watchdog: shwdt: register device only after full driver init Date: Mon, 14 Sep 2026 19:36:09 +0700 Message-Id: <20260914123609.2186477-1-congnt264@gmail.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit sh_wdt_probe() calls watchdog_register_device() -- exposing /dev/watchdogN -- before timer_setup() and pm_runtime_enable() run. A start command landing in that window calls mod_timer() on an uninitialized timer (NULL ->function) and resumes via pm_runtime_get_sync() before PM is enabled. Move timer_setup() and pm_runtime_enable() before the register call, matching the order already used by rzg2l_wdt.c/rzv2h_wdt.c. Add pm_runtime_disable() on the now-possible post-enable register-failure path. Fixes: 8f5585ec3d17 ("watchdog: shwdt: driver model conversion.") Assisted-by: Claude:claude-opus-4 Signed-off-by: Cong Nguyen --- drivers/watchdog/shwdt.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/watchdog/shwdt.c b/drivers/watchdog/shwdt.c index 719f100aae60..c22b8e760476 100644 --- a/drivers/watchdog/shwdt.c +++ b/drivers/watchdog/shwdt.c @@ -263,19 +263,20 @@ static int sh_wdt_probe(struct platform_device *pdev) dev_info(&pdev->dev, "configured with heartbeat=%d sec (nowayout=%d)\n", sh_wdt_dev.timeout, nowayout); + timer_setup(&wdt->timer, sh_wdt_ping, 0); + wdt->timer.expires = next_ping_period(clock_division_ratio); + + pm_runtime_enable(&pdev->dev); + rc = watchdog_register_device(&sh_wdt_dev); if (unlikely(rc)) { dev_err(&pdev->dev, "Can't register watchdog (err=%d)\n", rc); + pm_runtime_disable(&pdev->dev); return rc; } - timer_setup(&wdt->timer, sh_wdt_ping, 0); - wdt->timer.expires = next_ping_period(clock_division_ratio); - dev_info(&pdev->dev, "initialized.\n"); - pm_runtime_enable(&pdev->dev); - return 0; } -- 2.25.1