From mboxrd@z Thu Jan 1 00:00:00 1970 From: Soren Brinkmann Subject: [PATCH 7/9] tty: xuartps: Acquire port lock for shutdown Date: Tue, 3 Nov 2015 16:20:48 -0800 Message-ID: <1446596450-20918-8-git-send-email-soren.brinkmann@xilinx.com> References: <1446596450-20918-1-git-send-email-soren.brinkmann@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1446596450-20918-1-git-send-email-soren.brinkmann@xilinx.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Greg Kroah-Hartman , Jiri Slaby Cc: linux-arm-kernel@lists.infradead.org, Soren Brinkmann , Michal Simek , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-serial@vger.kernel.org Shutting down the UART port can happen while console operations are in progress. Holding the port lock serializes these operations and avoids the UART HW to be disabled in the middle of console prints. Signed-off-by: Soren Brinkmann --- drivers/tty/serial/xilinx_uartps.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 544ea13e2e93..4904eec37621 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -823,6 +823,9 @@ static int cdns_uart_startup(struct uart_port *port) static void cdns_uart_shutdown(struct uart_port *port) { int status; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); /* Disable interrupts */ status = readl(port->membase + CDNS_UART_IMR_OFFSET); @@ -832,6 +835,9 @@ static void cdns_uart_shutdown(struct uart_port *port) /* Disable the TX and RX */ writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, port->membase + CDNS_UART_CR_OFFSET); + + spin_unlock_irqrestore(&port->lock, flags); + free_irq(port->irq, port); } -- 2.6.2.3.ga463a5b