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[2a02:3100:a8d0:bc01:6d31:3d12:3a11:d2d0]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1fd4453823sm185693866b.40.2026.07.31.07.40.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Jul 2026 07:40:22 -0700 (PDT) Date: Fri, 31 Jul 2026 16:40:21 +0200 From: Karl Mehltretter To: Frank Li Cc: Greg Kroah-Hartman , Jiri Slaby , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Sashiko , stable@vger.kernel.org Subject: Re: [PATCH v2 4/4] serial: imx: serialize imx_uart_ports[] lifetime Message-ID: References: <20260719221014.44354-1-kmehltretter@gmail.com> <20260719221014.44354-5-kmehltretter@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260731_074025_404093_E8E9AA57 X-CRM114-Status: GOOD ( 10.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jul 30, 2026 at 02:02:05PM +0100, Frank Li wrote: > imx_uart_remove() > { > imx_uart_ports[line] = NULL; > uart_remove_one_port(&imx_uart_uart_driver, &sport->port); > } > > Is above sequence to avoid use mutex? > I now tried this, but it doesn't work as-is: uart_add_one_port() may call imx_uart_console_setup(), so the entry must be present before the call. uart_remove_one_port() unregisters the console. Clearing the entry first causes its callbacks to dereference NULL. The mutex protects those sequences against sibling probes. Thanks, Karl