hyperv/vmbus: Fix the racy channel close.
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Authored by sepherosa_gmail.com on Jul 5 2016, 3:16 PM.

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howard0su_gmail.com
honzhan_microsoft.com
decui_microsoft.com
delphij
royger

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rS302818: hyperv/vmbus: Fix the racy channel close.

Summary

It is not safe to iterate the sub-channel list w/o lock on the
close path, while it's even more difficult to hold the lock
and iterate the sub-channel list.  We leverage the
vmbua_{get,rel}_subchan() functions to solve this dilemma.

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rS FreeBSD src repository - subversion

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sepherosa_gmail.com updated this revision to Diff 18150.Jul 5 2016, 3:16 PM

sepherosa_gmail.com retitled this revision from to hyperv/vmbus: Fix the racy channel close..

sepherosa_gmail.com updated this object.

sepherosa_gmail.com edited the test plan for this revision. (Show Details)

sepherosa_gmail.com added reviewers: delphij, royger, decui_microsoft.com, honzhan_microsoft.com, howard0su_gmail.com.

Closed by commit rS302818: hyperv/vmbus: Fix the racy channel close. (authored by sephe). · Explain WhyJul 14 2016, 7:59 AM

This revision was automatically updated to reflect the committed changes.

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Path

Size

head/

sys/

dev/

hyperv/

vmbus/

hv_channel.c

39 lines

Diff 18417

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head/sys/dev/hyperv/vmbus/hv_channel.c

hyperv/vmbus: Fix the racy channel close.ClosedPublicActions