virtio: rng: disallow multiple device registrations, fixes crashes
authorAmit Shah <amit.shah@redhat.com>
Fri, 8 Mar 2013 00:30:18 +0000 (11:30 +1100)
committerRusty Russell <rusty@rustcorp.com.au>
Fri, 8 Mar 2013 00:30:43 +0000 (11:30 +1100)
commite84e7a56a3aa2963db506299e29a5f3f09377f9b
tree3c368fc922977af1760932c55fcfb69e20126cfa
parentf7f154f1246ccc5a0a7e9ce50932627d60a0c878
virtio: rng: disallow multiple device registrations, fixes crashes

The code currently only supports one virtio-rng device at a time.
Invoking guests with multiple devices causes the guest to blow up.

Check if we've already registered and initialised the driver.  Also
cleanup in case of registration errors or hot-unplug so that a new
device can be used.

Reported-by: Peter Krempa <pkrempa@redhat.com>
Reported-by: <yunzheng@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
drivers/char/hw_random/virtio-rng.c