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Differential D26297

[unix(4) cleanup 4/8] Simplify unp_disconnect() callers.
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Authored by markj on Sep 2 2020, 4:56 PM.
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rS365762: Simplify unp_disconnect() callers.
Summary

In all cases, PCBs are unlocked after unp_disconnect() returns. Since
unp_disconnect() may release the last PCB reference, callers may have to
bump the refcount before the call just so that they can release them
again.

Change unp_disconnect() to release PCB locks as well as connection
references. Remove code that bumps and then releases the refcount.
Tighten assertions.

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rS FreeBSD src repository - subversion
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Event Timeline

markj requested review of this revision.Sep 2 2020, 4:56 PM
markj created this revision.
Harbormaster completed remote builds in B33329: Diff 76543.Sep 2 2020, 4:56 PM
markj added a parent revision: D26296: [unix(4) cleanup 3/8] Rename unp_pcb_lock2()..Sep 2 2020, 5:08 PM
markj added a child revision: D26298: [unix(4) cleanup 5/8] Avoid an unnecessary malloc() for dgram sockets..
emaste added a subscriber: emaste.Sep 2 2020, 5:20 PM
markj updated this revision to Diff 76550.Sep 2 2020, 5:58 PM

Use unp_pcb_unlock_pair().

Harbormaster completed remote builds in B33336: Diff 76550.Sep 2 2020, 5:58 PM
kevans mentioned this in D26295: [unix(4) cleanup 2/8] Improve unix socket refcounting..Sep 3 2020, 5:07 PM
markj added inline comments.Sep 3 2020, 5:46 PM
sys/kern/uipc_usrreq.c
2003 ↗(On Diff #76550)

There is a bug here, fixed later in the series: if unp_conn == NULL we might in fact be dropping the last reference here.

markj updated this revision to Diff 76668.Sep 4 2020, 8:14 PM

Don't use unp_pcb_rele_notlast() when we may in fact be releasing the last ref.

Harbormaster completed remote builds in B33400: Diff 76668.Sep 4 2020, 8:14 PM
This revision was not accepted when it landed; it landed in state Needs Review.Sep 15 2020, 7:22 PM
Closed by commit rS365762: Simplify unp_disconnect() callers. (authored by markj). · Explain Why
This revision was automatically updated to reflect the committed changes.
markj added a commit: rS365762: Simplify unp_disconnect() callers..
Herald added a subscriber: imp. · View Herald TranscriptSep 15 2020, 7:22 PM

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sys/
kern/
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Diff 77068

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head/sys/kern/uipc_usrreq.c

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