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Thu, 06 Aug 2026 14:27:13 -0700 (PDT) Sender: Guenter Roeck Date: Thu, 6 Aug 2026 14:27:13 -0700 From: Guenter Roeck To: =?iso-8859-1?Q?Ren=EA?= de Souza Pinto Cc: Wim Van Sebroeck , "open list:WATCHDOG DEVICE DRIVERS" , open list Subject: Re: [PATCH v2] watchdog: wdat_wdt: map registers that fall inside ACPI NVS Message-ID: <671d52f2-c22f-46dd-84cd-95b2dc6d52cd@roeck-us.net> References: <20260804092337.3556947-1-rene@renesp.com.br> <20260804103958.3684195-1-rene@renesp.com.br> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260804103958.3684195-1-rene@renesp.com.br> On Tue, Aug 04, 2026 at 12:39:57PM +0200, Renê de Souza Pinto wrote: > Some firmwares describe WDAT registers inside memory ranges marked as > ACPI NVS in the E820 map, failing with -EBUSY during probe, leaving the > hardware watchdog unserviced and triggering periodic system resets. > > This issue was observed on a OnLogic Karbon 524 device (when watchdog is > enabled in BIOS): > > wdat_wdt wdat_wdt: error -EBUSY: can't request region for resource [mem 0x63df7a98] > wdat_wdt wdat_wdt: probe with driver wdat_wdt failed with error -16 > > Check whether the region falls inside ACPI NVS before requesting it and, > if so, map it without reservation. > > Signed-off-by: Renê de Souza Pinto Applied. Thanks, Guenter