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Commit 6280f190 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Jeremy Fitzhardinge
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implement O_NONBLOCK for /proc/xen/xenbus 



This patch implements O_NONBLOCK for /proc/xen/xenbus.  It is a simple
matter of returning -EAGAIN instead of waiting on a queue.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 4c31a781

drivers/xen/xenfs/xenbus.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -122,6 +122,9 @@ static ssize_t xenbus_file_read(struct file *filp, 
	mutex_lock(&u->reply_mutex);

	mutex_lock(&u->reply_mutex);

	while (list_empty(&u->read_buffers)) {

	while (list_empty(&u->read_buffers)) {

		mutex_unlock(&u->reply_mutex);

		mutex_unlock(&u->reply_mutex);

		if (filp->f_flags & O_NONBLOCK)

			return -EAGAIN;



		ret = wait_event_interruptible(u->read_waitq,

		ret = wait_event_interruptible(u->read_waitq,

					       !list_empty(&u->read_buffers));

					       !list_empty(&u->read_buffers));

		if (ret)

		if (ret)