From b6ad29355560beef6d127c6d33fb10ec0113bd85 Mon Sep 17 00:00:00 2001 From: Tomasz Figa Date: Tue, 26 Mar 2013 15:57:35 +0100 Subject: [PATCH] tty: serial: samsung: Disable interrupts in a suspend-friendly way Since the interrupt mask register is not preserved across system suspend and it defaults to all interrupts enabled, it is not enough to disable UART interrupt. This patch adds free_irq to port shutdown and mask setting to port startup to handle IRQ disabling in a suspend-friendly way. In addition, a bug caused by multiple request_irq calls in port startup callback is fixed. Signed-off-by: Tomasz Figa Signed-off-by: Kyungmin Park Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 2769a38d15b6..b386fc8a5eec 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -446,6 +446,8 @@ static void s3c24xx_serial_shutdown(struct uart_port *port) /* Clear pending interrupts and mask all interrupts */ if (s3c24xx_serial_has_interrupt_mask(port)) { + free_irq(port->irq, ourport); + wr_regl(port, S3C64XX_UINTP, 0xf); wr_regl(port, S3C64XX_UINTM, 0xf); } @@ -505,6 +507,8 @@ static int s3c64xx_serial_startup(struct uart_port *port) dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n", port->mapbase, port->membase); + wr_regl(port, S3C64XX_UINTM, 0xf); + ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED, s3c24xx_serial_portname(port), ourport); if (ret) { -- 2.34.1