https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280651
Bug ID: 280651
Summary: [patch] nmdm: Allow module to be force-unloaded
Product: Base System
Version: 13.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 252541
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=252541&action=edit
Fix double lock and typo and incorrect order of locking
If an nmdm device was created by accident such as by running
ls /dev/nmdmAA, it would restrict the module from being unloaded,
despite no data passing through it.
With this patch, kldunload nmdm will still fail if any nmdm device still
exists.
kldunload -f nmdm will try to destroy all nmdm devices before unloading.
If an nmdm modem is either opened in blocking mode or data is being
passed through it, after five seconds of trying, it will not be destroyed
and the unload will also fail.
Likewise, fix an incorrect tty_lock, a typo, and the order of locking.
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