serial: imx: let irq handler return IRQ_NONE if no event was handled
This gives the irq core a chance to disable the serial interrupt in case
an event isn't cleared in the handler.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 7cfb482..4676916 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -737,6 +737,7 @@
struct imx_port *sport = dev_id;
unsigned int sts;
unsigned int sts2;
+ irqreturn_t ret = IRQ_NONE;
sts = readl(sport->port.membase + USR1);
sts2 = readl(sport->port.membase + USR2);
@@ -746,26 +747,34 @@
imx_dma_rxint(sport);
else
imx_rxint(irq, dev_id);
+ ret = IRQ_HANDLED;
}
if ((sts & USR1_TRDY &&
readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) ||
(sts2 & USR2_TXDC &&
- readl(sport->port.membase + UCR4) & UCR4_TCEN))
+ readl(sport->port.membase + UCR4) & UCR4_TCEN)) {
imx_txint(irq, dev_id);
+ ret = IRQ_HANDLED;
+ }
- if (sts & USR1_RTSD)
+ if (sts & USR1_RTSD) {
imx_rtsint(irq, dev_id);
+ ret = IRQ_HANDLED;
+ }
- if (sts & USR1_AWAKE)
+ if (sts & USR1_AWAKE) {
writel(USR1_AWAKE, sport->port.membase + USR1);
+ ret = IRQ_HANDLED;
+ }
if (sts2 & USR2_ORE) {
sport->port.icount.overrun++;
writel(USR2_ORE, sport->port.membase + USR2);
+ ret = IRQ_HANDLED;
}
- return IRQ_HANDLED;
+ return ret;
}
/*