diff options
| author | Peter Korsgaard <jacmet@sunsite.dk> | 2009-09-09 16:54:04 +0200 |
|---|---|---|
| committer | Live-CD User <linux@linux.site> | 2009-09-19 13:13:38 -0700 |
| commit | d2cfe9628c6187cafd1aac32a44dcd9ed7adb5fe (patch) | |
| tree | 8d341d3df935aa1710df451975f80eebdf3e61c2 | |
| parent | 054f2346cb0e524cbb678759bfedabfdba4d0100 (diff) | |
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>
| -rw-r--r-- | drivers/serial/uartlite.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c index 5d3a573d6994..377f2712289e 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; |