From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Kleine-Budde Subject: [PATCH 1/4] can: sja1000: fix {pre,post}_irq() handling and IRQ handler return value Date: Wed, 27 Nov 2013 22:11:32 +0100 Message-ID: <1385586695-11134-2-git-send-email-mkl@pengutronix.de> References: <1385586695-11134-1-git-send-email-mkl@pengutronix.de> Cc: davem@davemloft.net, linux-can@vger.kernel.org, kernel@pengutronix.de, Oliver Hartkopp , linux-stable , Marc Kleine-Budde To: netdev@vger.kernel.org Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:49146 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753802Ab3K0VLs (ORCPT ); Wed, 27 Nov 2013 16:11:48 -0500 In-Reply-To: <1385586695-11134-1-git-send-email-mkl@pengutronix.de> Sender: netdev-owner@vger.kernel.org List-ID: From: Oliver Hartkopp This patch fixes the issue that the sja1000_interrupt() function may have returned IRQ_NONE without processing the optional pre_irq() and post_irq() function before. Further the irq processing counter 'n' is moved to the end of the while statement to return correct IRQ_[NONE|HANDLED] values at error conditions. Reported-by: Wolfgang Grandegger Acked-by: Wolfgang Grandegger Signed-off-by: Oliver Hartkopp Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/sja1000/sja1000.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index 7164a99..f17c301 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -494,20 +494,20 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id) uint8_t isrc, status; int n = 0; - /* Shared interrupts and IRQ off? */ - if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) - return IRQ_NONE; - if (priv->pre_irq) priv->pre_irq(priv); + /* Shared interrupts and IRQ off? */ + if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF) + goto out; + while ((isrc = priv->read_reg(priv, SJA1000_IR)) && (n < SJA1000_MAX_IRQ)) { - n++; + status = priv->read_reg(priv, SJA1000_SR); /* check for absent controller due to hw unplug */ if (status == 0xFF && sja1000_is_absent(priv)) - return IRQ_NONE; + goto out; if (isrc & IRQ_WUI) netdev_warn(dev, "wakeup interrupt\n"); @@ -535,7 +535,7 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id) status = priv->read_reg(priv, SJA1000_SR); /* check for absent controller */ if (status == 0xFF && sja1000_is_absent(priv)) - return IRQ_NONE; + goto out; } } if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) { @@ -543,8 +543,9 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id) if (sja1000_err(dev, isrc, status)) break; } + n++; } - +out: if (priv->post_irq) priv->post_irq(priv); -- 1.8.5.rc0