This is a note to let you know that I've just added the patch titled
can: sja1000: fix {pre,post}_irq() handling and IRQ handler return value
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-sja1000-fix-pre-post-_irq-handling-and-irq-handler-return-value.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f484718617526801dcb4294c0e9a2367dfc6d7c Mon Sep 17 00:00:00 2001
From: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Date: Thu, 21 Nov 2013 18:03:07 +0100
Subject: can: sja1000: fix {pre,post}_irq() handling and IRQ handler return value
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>
[bwh: Backported to 3.2: s/SJA1000_IER/REG_IER/; s/SJA1000_IR/REG_IR/]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/sja1000/sja1000.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -487,19 +487,19 @@ irqreturn_t sja1000_interrupt(int irq, v
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, v
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, v
if (sja1000_err(dev, isrc, status))
break;
}
+ n++;
}
-
+out:
if (priv->post_irq)
priv->post_irq(priv);
Patches currently in stable-queue which might be from socketcan@xxxxxxxxxxxx are
queue-3.4/can-sja1000-fix-pre-post-_irq-handling-and-irq-handler-return-value.patch
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