[Bug 230220] UFS: the freezing ioctl (i.e.UFSSUSPEND) causes panic or EBUSY

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230220

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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 Attachment #195682|0                           |1
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--- Comment #8 from Konstantin Belousov <kib at FreeBSD.org> ---
Created attachment 195685
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195685&action=edit
another fix, unsuspend on devfs_set_cdevpriv() error.

Issue with the previous fix is that mt process could suspend in two parallel
threads, then devfs_set_cdevpriv() would still fail.

Note that ffs_susp_lock was held, so I do not think that ffs_reload() is
needed.

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