On Mon, Jan 20, 2020 at 09:30:43AM +0000, Vladimir Stankovic wrote:
> +int mausb_enqueue_event_from_user(uint8_t madev_addr, uint32_t all_events)
> +{
> + unsigned long flags;
> + uint16_t num_of_completed,
> + num_of_events;
> + struct mausb_device *dev;
> +
> + spin_lock_irqsave(&mss.lock, flags);
> + dev = mausb_get_dev_from_addr_unsafe(madev_addr);
> +
> + if (!dev) {
> + spin_unlock_irqrestore(&mss.lock, flags);
> + return 0;
> + }
> +
> + spin_lock_irqsave(&dev->num_of_user_events_lock, flags);
> + num_of_completed = (uint16_t)all_events +
> + (uint16_t)dev->num_of_user_events;
> + num_of_events = (all_events >> (8 * sizeof(num_of_events))) +
> + (dev->num_of_user_events >> (8 * sizeof(num_of_events)));
> + dev->num_of_user_events = num_of_completed;
> + dev->num_of_user_events |= (uint32_t)num_of_events <<
> + (8 * sizeof(num_of_events));
I might be missing something. Why can't we just declare two struct
members instead of doing these bit shifts to fit two values into
dev->num_of_user_events?
> + spin_unlock_irqrestore(&dev->num_of_user_events_lock, flags);
> + queue_work(dev->workq, &dev->work);
> + spin_unlock_irqrestore(&mss.lock, flags);
> +
> + return 0;
> +}
regards,
dan carpenter
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