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Fri, 8 May 2026 15:16:19 +0000 From: "Ionut Nechita (Wind River)" To: ilpo.jarvinen@linux.intel.com, gregkh@linuxfoundation.org Cc: stable@vger.kernel.org, linux-serial@vger.kernel.org, andriy.shevchenko@linux.intel.com, ionut.nechita@windriver.com, chris.friesen@windriver.com Subject: [REQUEST] Backport 8250_dw BUSY deassert series to 6.12.y stable Date: Fri, 8 May 2026 18:16:14 +0300 Message-ID: <20260508151614.498810-1-ionut.nechita@windriver.com> X-Mailer: git-send-email 2.43.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: VI1P190CA0026.EURP190.PROD.OUTLOOK.COM (2603:10a6:802:2b::39) To SJ2PR11MB7546.namprd11.prod.outlook.com (2603:10b6:a03:4cc::8) Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7546:EE_|PH7PR11MB6793:EE_ X-MS-Office365-Filtering-Correlation-Id: 8f0c39ec-60ec-4a71-7404-08dead14c187 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scancount=1 engine=8.22.0-2604200000 definitions=main-2605080152 From: Ionut Nechita Hi Ilpo, Greg, We're running kernel 6.12 (LTS) on production systems with DesignWare 8250 UARTs and are hitting the BUSY assertion issue that your recent series addresses in 6.18: Ilpo Järvinen (7): serial: 8250: Protect LCR write in shutdown serial: 8250_dw: Avoid unnecessary LCR writes serial: 8250: Add serial8250_handle_irq_locked() serial: 8250_dw: Rework dw8250_handle_irq() locking and IIR handling serial: 8250_dw: Rework IIR_NO_INT handling to stop interrupt storm serial: 8250: Add late synchronize_irq() to shutdown to handle DW UART BUSY serial: 8250_dw: Ensure BUSY is deasserted Patch 7/7 has Cc: stable, but it depends on patches 1-6 for the new infrastructure (serial8250_handle_irq_locked(), the reworked locking in dw8250_handle_irq(), etc.). Could the full series be nominated for 6.12.y stable backport? Or if that's too invasive for stable, could you advise on the minimal subset that would allow patch 7 to apply cleanly on 6.12? We've attempted a standalone backport of patch 7 (squashing the necessary helpers from 8250_port.c), but the IRQ handler refactoring in patches 3-5 changes the locking model significantly, and we'd rather carry the maintainer-blessed version than risk introducing subtle races. Our environment: - Kernel: 6.12.57-rt/6.12.87-rt (PREEMPT_RT) - Hardware: Intel platforms with DW APB UART (snps,dw-apb-uart) - Symptom: LCR writes silently ignored under Rx load, causing baud rate / framing mismatches after set_termios We are available to test any backport candidates on our hardware. Thanks, Ionut ---