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Commit a1a15ac5 authored by Kris Shannon's avatar Kris Shannon Committed by Jens Axboe
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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.
parent 559595a9
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