uartlite: support shared interrupt lines
Adapt isr to work with shared interrupt lines. Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -154,17 +154,22 @@ static int ulite_transmit(struct uart_port *port, int stat)
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static irqreturn_t ulite_isr(int irq, void *dev_id)
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{
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struct uart_port *port = dev_id;
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int busy;
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int busy, n = 0;
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do {
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int stat = readb(port->membase + ULITE_STATUS);
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busy = ulite_receive(port, stat);
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busy |= ulite_transmit(port, stat);
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n++;
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} while (busy);
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tty_flip_buffer_push(port->state->port.tty);
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return IRQ_HANDLED;
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/* work done? */
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if (n > 1) {
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tty_flip_buffer_push(port->state->port.tty);
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return IRQ_HANDLED;
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} else {
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return IRQ_NONE;
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}
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}
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static unsigned int ulite_tx_empty(struct uart_port *port)
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@ -221,7 +226,7 @@ static int ulite_startup(struct uart_port *port)
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int ret;
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ret = request_irq(port->irq, ulite_isr,
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IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port);
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IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", port);
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if (ret)
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return ret;
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