diff options
| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2013-11-21 18:03:07 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-07 16:02:15 -0700 |
| commit | f7c02bf438f74ce4c7a8fb0c79cd435d85a795be (patch) | |
| tree | f7e502e73eb7099de3fe03cbaf7114b3538296e9 /drivers | |
| parent | 4381872d5a41635275c291f2a7c523197ba1f5e1 (diff) | |
can: sja1000: fix {pre,post}_irq() handling and IRQ handler return value
commit 2fea6cd303c0d0cd9067da31d873b6a6d5bd75e7 upstream.
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 <wg@grandegger.com>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
[bwh: Backported to 3.2: s/SJA1000_IER/REG_IER/; s/SJA1000_IR/REG_IR/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/can/sja1000/sja1000.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c index c2309ec7136..2d3ad72958f 100644 --- a/drivers/net/can/sja1000/sja1000.c +++ b/drivers/net/can/sja1000/sja1000.c @@ -487,19 +487,19 @@ 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, REG_IER) == IRQ_OFF) - return IRQ_NONE; - if (priv->pre_irq) priv->pre_irq(priv); + /* Shared interrupts and IRQ off? */ + if (priv->read_reg(priv, REG_IER) == IRQ_OFF) + goto out; + while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) { - n++; + status = priv->read_reg(priv, SJA1000_REG_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"); @@ -518,7 +518,7 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id) status = priv->read_reg(priv, SJA1000_REG_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)) { @@ -526,8 +526,9 @@ 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); |