On 9/26/20 9:18 PM, William Breathitt Gray wrote:
+static irqreturn_t quad8_irq_handler(int irq, void *quad8iio)
+{
+ struct quad8_iio *const priv = quad8iio;
+ const unsigned long base = priv->base;
+ unsigned long irq_status;
+ unsigned long channel;
+ u8 event;
+ int err;
+
+ irq_status = inb(base + QUAD8_REG_INTERRUPT_STATUS);
+ if (!irq_status)
+ return IRQ_NONE;
+
+ for_each_set_bit(channel, &irq_status, QUAD8_NUM_COUNTERS) {
+ switch (priv->irq_trigger[channel]) {
+ case 0:
+ event = COUNTER_EVENT_OVERFLOW;
+ break;
+ case 1:
+ event = COUNTER_EVENT_THRESHOLD;
+ break;
+ case 2:
+ event = COUNTER_EVENT_OVERFLOW_UNDERFLOW;
+ break;
+ case 3:
+ event = COUNTER_EVENT_INDEX;
+ break;
+ default:
+ /* We should never reach here */
+ return -EINVAL;
This is not a valid return value for an IRQ handler. Maybe WARN_ONCE instead?
+ }
+ err = counter_push_event(&priv->counter, event, channel);
+ if (err)
+ return err;
Same here. Otherwise, I think we could end up with interrupts in an endless
loop since the interrupt would never be cleared.
+ }
+
+ /* Clear pending interrupts on device */
+ outb(QUAD8_CHAN_OP_ENABLE_INTERRUPT_FUNC, base + QUAD8_REG_CHAN_OP);
+
+ return IRQ_HANDLED;
+}
+
