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Mon, 08 Jun 2026 13:09:52 -0700 (PDT) From: Rosen Penev To: linux-watchdog@vger.kernel.org Cc: Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Wim Van Sebroeck , Guenter Roeck , linux-arm-kernel@lists.infradead.org (moderated list:ARM/Microchip (AT91) SoC support), linux-kernel@vger.kernel.org (open list) Subject: [PATCHv2 1/3] watchdog: sama5d4: fix shared IRQ and hardcoded timeout issues Date: Mon, 8 Jun 2026 13:09:31 -0700 Message-ID: <20260608200933.18669-2-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260608200933.18669-1-rosenp@gmail.com> References: <20260608200933.18669-1-rosenp@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix three pre-existing issues in the sama5d4 watchdog driver: 1. Unsafe IRQF_SHARED | IRQF_NO_SUSPEND combination: The watchdog interrupt is a dedicated peripheral line, not shared with other devices. 2. Unconditional IRQ_HANDLED on shared line: The handler returned IRQ_HANDLED even when the status register indicated no watchdog interrupt was pending. Return IRQ_NONE in that case so the kernel can properly detect spurious interrupts on the line. 3. Hardcoded 16-second timeout: sama5d4_wdt_init() unconditionally used WDT_DEFAULT_TIMEOUT (16s) for the hardware timeout, ignoring any timeout configured via device tree (watchdog_init_timeout) or userspace. Pass wdd->timeout to sama5d4_wdt_init() so the configured timeout is honored during probe and resume. Assisted-by: opencode:big-pickle Signed-off-by: Rosen Penev --- drivers/watchdog/sama5d4_wdt.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/watchdog/sama5d4_wdt.c b/drivers/watchdog/sama5d4_wdt.c index 704b786cc2ec..f74f1e8956b5 100644 --- a/drivers/watchdog/sama5d4_wdt.c +++ b/drivers/watchdog/sama5d4_wdt.c @@ -169,11 +169,12 @@ static irqreturn_t sama5d4_wdt_irq_handler(int irq, void *dev_id) else reg = wdt_read(wdt, AT91_WDT_SR); - if (reg) { - pr_crit("Atmel Watchdog Software Reset\n"); - emergency_restart(); - pr_crit("Reboot didn't succeed\n"); - } + if (!reg) + return IRQ_NONE; + + pr_crit("Atmel Watchdog Software Reset\n"); + emergency_restart(); + pr_crit("Reboot didn't succeed\n"); return IRQ_HANDLED; } @@ -197,11 +198,11 @@ static int of_sama5d4_wdt_init(struct device_node *np, struct sama5d4_wdt *wdt) return 0; } -static int sama5d4_wdt_init(struct sama5d4_wdt *wdt) +static int sama5d4_wdt_init(struct sama5d4_wdt *wdt, unsigned int timeout) { u32 reg, val; - val = WDT_SEC2TICKS(WDT_DEFAULT_TIMEOUT); + val = WDT_SEC2TICKS(timeout); /* * When booting and resuming, the bootloader may have changed the * watchdog configuration. @@ -305,7 +306,7 @@ static int sama5d4_wdt_probe(struct platform_device *pdev) set_bit(WDOG_HW_RUNNING, &wdd->status); } - ret = sama5d4_wdt_init(wdt); + ret = sama5d4_wdt_init(wdt, wdd->timeout); if (ret) return ret; @@ -358,7 +359,7 @@ static int sama5d4_wdt_resume_early(struct device *dev) * This should only be done when the registers are lost on suspend but * there is no way to get this information right now. */ - sama5d4_wdt_init(wdt); + sama5d4_wdt_init(wdt, wdt->wdd.timeout); if (watchdog_active(&wdt->wdd)) sama5d4_wdt_start(&wdt->wdd); -- 2.54.0