[Xen-changelog] Prevent opening the xenbus device if the store isn't connected yet.

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

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 0fad07d67e758290d5921a82f6099fa6c186099f
# Parent  f804b28871baa0cd6b58a3c446a0a1b399eba4c3
Prevent opening the xenbus device if the store isn't connected yet.
Running xenstore clients using the xenbus device before the store
connection has been set up causes a crash because the store page
won't have been allocated yet.  This is only a problem in dom0 where
we setup the store page from the PRIVCMD_INITDOMAIN_STORE ioctl.
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r f804b28871ba -r 0fad07d67e75 
linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c
--- a/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c      Tue Sep 13 
09:11:58 2005
+++ b/linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_dev.c      Tue Sep 13 
10:05:49 2005
@@ -130,6 +130,9 @@
 {
        struct xenbus_dev_data *u;
 
+       if (xen_start_info->store_evtchn == 0)
+               return -ENOENT;
+
        /* Don't try seeking. */
        nonseekable_open(inode, filp);
 

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