MFC 309128,309129,309131-309136,309138-309140,309224,309225

MFC 309128,309129,309131-309136,309138-309140,309224,309225

309128
    hyperv/vmbus: Commit the GPADL id only after the connection succeeds.

    Minor style change.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8563

309129
    hyperv/vmbus: Minor style changes.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8564

309131
    hyperv/vmbus: Fix sysctl tree leakage, if channel open fails.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8565

309132
    hyperv/vmbus: Don't close unopened channels.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8566

309133
    hyperv/vmbus: GPADL disconnect error on a revoked channel is benign.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8567

309134
    hyperv/vmbus: No stranded bufring GPADL is allowed.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8568

309135
    hyperv/vmbus: Return EISCONN if the bufring GPADL can't be disconnected.

    So that the callers of vmbus_chan_open_br() could handle the passed in
    bufring memory properly.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8569

309136
    hyperv/vmbus: Don't free the bufring if its GPADL can't be disconnected.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8570

309138
    hyperv/vmbus: Always try disconnect/free bufring memory upon channel close

    While I'm here, minor wording and style changes.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8598

309139
    hyperv/vmbus: Propagate close error.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8599

309140
    hyperv/vmbus: Add a simplified version of channel close.

    So that the caller can know the channel close error and react accordingly.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8600

309224
    hyperv/vmbus: Zero out GPADL if error happens.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8601

309225
    hyperv/vmbus: Add supportive transaction wait function.

    This function supports channel revocation properly.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8611

git-svn-id: svn://svn.freebsd.org/base/stable/10@310751 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f