Kris Shannon a1a15ac5f9
Fix kernel NULL pointer dereference in xen-blkfront ...
When booting Xen Dom0 on a pre-release 3.2.1 hypervisor the system Oopses on a
"Unable to handle kernel NULL pointer dereference" in xenwatch.
From the backtrace it looks like backend_changed is calling bdget_disk
with a NULL pointer. Checking for NULL and returning ENODEV instead
allows the kernel to boot.
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Kris Shannon
a1a15ac5f9