Differential D26297

[unix(4) cleanup 4/8] Simplify unp_disconnect() callers.
ClosedPublic
Actions

Authored by markj on Sep 2 2020, 4:56 PM.

Tags

None

Referenced Files

	Unknown Object (File)
	Tue, Jan 21, 11:22 PM

	Unknown Object (File)
	Fri, Jan 3, 5:58 PM

	Unknown Object (File)
	Dec 13 2024, 5:12 PM

	Unknown Object (File)
	Nov 21 2024, 6:06 AM

	Unknown Object (File)
	Oct 31 2024, 11:43 PM

	Unknown Object (File)
	Oct 2 2024, 8:36 PM

	Unknown Object (File)
	Sep 30 2024, 5:22 PM

	Unknown Object (File)
	Sep 27 2024, 10:51 PM

View All 81 Files

Subscribers

Details

Reviewers: None
Commits: 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.

Diff Detail

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 33336
Build 30647: arc lint + arc unit

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

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

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

Revision Contents
Changeset List

Path

Size

sys/

kern/

79 lines

Diff 76550

sys/kern/uipc_usrreq.c

Loading...