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From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Martin Fuzzey <mfuzzey@parkeon.com>,
	Baruch Siach <baruch@tkos.co.il>,
	linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de,
	linux-serial@vger.kernel.org
Subject: [PATCH 3/4] serial: imx: let irq handler return IRQ_NONE if no event was handled
Date: Thu, 10 Mar 2016 11:26:08 +0100	[thread overview]
Message-ID: <1457605569-7828-4-git-send-email-u.kleine-koenig@pengutronix.de> (raw)
In-Reply-To: <1457605569-7828-1-git-send-email-u.kleine-koenig@pengutronix.de>

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/tty/serial/imx.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5586260059aa..2e91598285dc 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -785,6 +785,7 @@ static irqreturn_t imx_int(int irq, void *dev_id)
 	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);
@@ -799,8 +800,10 @@ static irqreturn_t imx_int(int irq, void *dev_id)
 	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_DTRD) || (sts2 & (USR2_DCDDELT | USR2_RIDELT))) {
 		unsigned long flags;
@@ -814,20 +817,26 @@ static irqreturn_t imx_int(int irq, void *dev_id)
 		if (sts2 & (USR2_DCDDELT | USR2_RIDELT))
 			writel(sts2 & (USR2_DCDDELT | USR2_RIDELT),
 			       sport->port.membase + USR2);
+		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;
 }
 
 /*
-- 
2.7.0


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  parent reply	other threads:[~2016-03-10 10:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-10 10:26 [PATCH 0/4] serial: imx: some irq and handshaking fixes Uwe Kleine-König
2016-03-10 10:26 ` [PATCH 1/4] serial: imx: reorder functions to simplify next patch Uwe Kleine-König
2016-03-10 10:26 ` [PATCH 2/4] serial: imx: implement handshaking irq handling for DTE mode Uwe Kleine-König
2016-03-10 10:26 ` Uwe Kleine-König [this message]
2016-03-10 10:26 ` [PATCH 4/4] serial: imx: only count 0->1 transitions for RNG Uwe Kleine-König
2016-03-24  8:14 ` [PATCH 0/4] serial: imx: some irq and handshaking fixes Uwe Kleine-König

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