[libvirt] [PATCH 1/4] libxl: MigrateBegin: Dont call EndAPI in helper function

[John Ferlan]

On 03/13/2018 01:26 PM, Jim Fehlig wrote:
> The libxlDomainMigrateBegin3Params API locks and ref counts the associated
> virDomainObj but relies on the helper function libxlDomainMigrationBegin
> to unref/unlock the object. libxlDomainMigrationBegin is also used by
> libxlDomainMigratePerform3Params for p2p migration, but in that case the
> lock/ref and unref/unlock are properly handled in the API entry point. So
> p2p migrations suffer a double unref/unlock in the Perform API.
> 
> Remove the unref/unlock (virDomainObjEndAPI) from libxlDomainMigrationBegin
> and adjust libxlDomainMigrateBegin3Params to properly unref/unlock
> the virDomainObj on success and error paths.
> 
> Signed-off-by: Jim Fehlig <jfehlig at suse.com>
> ---
>  src/libxl/libxl_driver.c    | 24 +++++++++++++-----------
>  src/libxl/libxl_migration.c |  1 -
>  2 files changed, 13 insertions(+), 12 deletions(-)
> 

Reviewed-by: John Ferlan <jferlan at redhat.com>

John

BTW: Outside the scope of this series; however, danpb went through the
painstaking task of modifying names of qemu_migration API's such that
it's easier to determine if the API was run on qemuMigrationSrc or
qemuMigrationDst - made it so much easier to remember which was which
w/r/t the various stages - you may want to consider doing that too for
libxl!