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can: sja1000: fix {pre,post}_irq() handling and IRQ handler return value 

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>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2013-11-21 18:03:07 +01:00 committed by Marc Kleine-Budde
parent 2c7a9dc164
commit 2fea6cd303
1 changed files with 9 additions and 8 deletions
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17
drivers/net/can/sja1000/sja1000.c
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@ -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);