[Xen-changelog] [linux-2.6.18-xen] Avoid kernel hang reading /sys/hypervisor/uuid if xenstore is not available.

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1206699677 0
# Node ID 080b0c482ad67dffdaed7eaf91ece34a42669c90
# Parent  0637d22ed554eb0b9cecc7a74fa0a77a7c456497
Avoid kernel hang reading /sys/hypervisor/uuid if xenstore is not available.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 drivers/xen/core/xen_sysfs.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r 0637d22ed554 -r 080b0c482ad6 drivers/xen/core/xen_sysfs.c
--- a/drivers/xen/core/xen_sysfs.c      Fri Mar 28 09:49:22 2008 +0000
+++ b/drivers/xen/core/xen_sysfs.c      Fri Mar 28 10:21:17 2008 +0000
@@ -104,6 +104,10 @@ static ssize_t uuid_show(struct hyp_sysf
 {
        char *vm, *val;
        int ret;
+       extern int xenstored_ready;
+
+       if (!xenstored_ready)
+               return -EBUSY;
 
        vm = xenbus_read(XBT_NIL, "vm", "", NULL);
        if (IS_ERR(vm))

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