From d2cfe9628c6187cafd1aac32a44dcd9ed7adb5fe Mon Sep 17 00:00:00 2001 From: Peter Korsgaard Date: Wed, 9 Sep 2009 16:54:04 +0200 Subject: uartlite: support shared interrupt lines Adapt isr to work with shared interrupt lines. Signed-off-by: Peter Korsgaard Signed-off-by: Greg Kroah-Hartman --- drivers/serial/uartlite.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c index 5d3a573d699..377f2712289 100644 --- a/drivers/serial/uartlite.c +++ b/drivers/serial/uartlite.c @@ -154,17 +154,22 @@ static int ulite_transmit(struct uart_port *port, int stat) static irqreturn_t ulite_isr(int irq, void *dev_id) { struct uart_port *port = dev_id; - int busy; + int busy, n = 0; do { int stat = readb(port->membase + ULITE_STATUS); busy = ulite_receive(port, stat); busy |= ulite_transmit(port, stat); + n++; } while (busy); - tty_flip_buffer_push(port->state->port.tty); - - return IRQ_HANDLED; + /* work done? */ + if (n > 1) { + tty_flip_buffer_push(port->state->port.tty); + return IRQ_HANDLED; + } else { + return IRQ_NONE; + } } static unsigned int ulite_tx_empty(struct uart_port *port) @@ -221,7 +226,7 @@ static int ulite_startup(struct uart_port *port) int ret; ret = request_irq(port->irq, ulite_isr, - IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port); + IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", port); if (ret) return ret; -- cgit v1.2.3-18-g5258