uio: dismiss waiters on device unregistration
When the device is unregistered, it should wake up the blocking waiters. Otherwise, they will sleep forever. Signed-off-by: Zhaolong Zhang <zhangzl2013@126.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -569,20 +569,20 @@ static ssize_t uio_read(struct file *filep, char __user *buf,
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ssize_t retval = 0;
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s32 event_count;
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mutex_lock(&idev->info_lock);
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if (!idev->info || !idev->info->irq)
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retval = -EIO;
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mutex_unlock(&idev->info_lock);
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if (retval)
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return retval;
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if (count != sizeof(s32))
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return -EINVAL;
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add_wait_queue(&idev->wait, &wait);
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do {
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mutex_lock(&idev->info_lock);
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if (!idev->info || !idev->info->irq) {
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retval = -EIO;
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mutex_unlock(&idev->info_lock);
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break;
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}
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mutex_unlock(&idev->info_lock);
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set_current_state(TASK_INTERRUPTIBLE);
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event_count = atomic_read(&idev->event);
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@ -1017,6 +1017,9 @@ void uio_unregister_device(struct uio_info *info)
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idev->info = NULL;
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mutex_unlock(&idev->info_lock);
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wake_up_interruptible(&idev->wait);
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kill_fasync(&idev->async_queue, SIGIO, POLL_HUP);
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device_unregister(&idev->dev);
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return;
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