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block: Reset device model callbacks on detach 

BlockDriverState members change_cb and change_opaque are initially
null.  The device model may set them, with bdrv_set_change_cb().  If
the device model gets detached (hot unplug), they're left dangling.
Only safe because device hot unplug automatically destroys the
BlockDriverState.  But that's a questionable feature, best not to rely
on it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2011-07-20 18:23:36 +02:00 committed by Kevin Wolf
parent ea8f942fe4
commit a19712b0db
1 changed files with 2 additions and 0 deletions
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2
block.c
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@ -730,6 +730,8 @@ void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
{ {
assert(bs->peer == qdev); assert(bs->peer == qdev);
bs->peer = NULL; bs->peer = NULL;
bs->change_cb = NULL;
bs->change_opaque = NULL;
} }
DeviceState *bdrv_get_attached(BlockDriverState *bs) DeviceState *bdrv_get_attached(BlockDriverState *bs)