3.8.13.15 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Acked-by: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx>
Signed-off-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
[ kamal: backport to 3.8 (renamed constant) ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/net/can/sja1000/sja1000.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 43921f9..8eb5a32 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -490,19 +490,19 @@ irqreturn_t sja1000_interrupt(int irq, void *dev_id)
uint8_t isrc, status;
int n = 0;
+ if (priv->pre_irq)
+ priv->pre_irq(priv);
+
/* 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);
-
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");
@@ -529,7 +529,7 @@ 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)) {
@@ -537,8 +537,9 @@ 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);
--
1.8.3.2
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