When force_irqthreads is true, the top halve is already threaded.
There's no need to spread the work over 2 threads in such case.
Signed-off-by: Kurt Van Dijck <dev.kurt@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/net/can/c_can/c_can.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 95de8e9..a4098a0 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -1101,6 +1101,16 @@ static irqreturn_t c_can_isr(int irq, void *dev_id)
return IRQ_WAKE_THREAD;
}
+static irqreturn_t c_can_isr_force_threaded(int irq, void *dev_id)
+{
+ irqreturn_t result;
+
+ result = c_can_isr(irq, dev_id);
+ if (result == IRQ_WAKE_THREAD)
+ result = c_can_thrd(irq, dev_id);
+ return result;
+}
+
static int c_can_open(struct net_device *dev)
{
int err;
@@ -1117,8 +1127,17 @@ static int c_can_open(struct net_device *dev)
}
/* register interrupt handler */
- err = request_threaded_irq(dev->irq, &c_can_isr, c_can_thrd,
- IRQF_SHARED, dev->name, dev);
+ if (force_irqthreads)
+ /* in case of forced irq threading, the top-halve is already
+ * a thread, so the bottom halve could be appended directly.
+ * For code re-use, the combined handler calls top & bottom
+ * rather than recoding everything from scratch
+ */
+ err = request_threaded_irq(dev->irq, &c_can_isr_force_threaded,
+ NULL, IRQF_SHARED, dev->name, dev);
+ else
+ err = request_threaded_irq(dev->irq, &c_can_isr,
+ c_can_thrd, IRQF_SHARED, dev->name, dev);
if (err < 0) {
netdev_err(dev, "failed to request interrupt\n");
goto exit_irq_fail;
--
1.8.5.rc3
