[Xen-changelog] Add poll() support to xenbus device file.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 056e571ce462d44612f2300ff17f589b2e43368b
# Parent  cf89e8f0831b3a483c1b8c614d1b8eb02180548b
Add poll() support to xenbus device file.

From: Gerd Hoffmann
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r cf89e8f0831b -r 056e571ce462 
linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c      Mon Mar 20 
08:56:54 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c      Mon Mar 20 
11:00:58 2006
@@ -36,6 +36,7 @@
 #include <linux/notifier.h>
 #include <linux/wait.h>
 #include <linux/fs.h>
+#include <linux/poll.h>
 
 #include "xenbus_comms.h"
 
@@ -207,11 +208,22 @@
        return 0;
 }
 
+static unsigned int xenbus_dev_poll(struct file *file, poll_table *wait)
+{
+       struct xenbus_dev_data *u = file->private_data;
+
+       poll_wait(file, &u->read_waitq, wait);
+       if (u->read_cons != u->read_prod)
+               return POLLIN | POLLRDNORM;
+       return 0;
+}
+
 static struct file_operations xenbus_dev_file_ops = {
        .read = xenbus_dev_read,
        .write = xenbus_dev_write,
        .open = xenbus_dev_open,
        .release = xenbus_dev_release,
+       .poll = xenbus_dev_poll,
 };
 
 static int __init

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