Peter Holm
e84a11e7ff
In tty_makedev() the following construction: ...
dev = make_dev_cred();
dev->si_drv1 = tp;
leaves a small window where the newly created device may be opened
and si_drv1 is NULL.
As this is a vary rare situation, using a lock to close the window
seems overkill. Instead just wait for the assignment of si_drv1.
Suggested by: kib
MFC after: 1 week
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e84a11e7ff