devlink: add function to take snapshot while locked
A future change is going to add a new devlink command to request a snapshot on demand. This function will want to call the devlink_region_snapshot_create function while already holding the devlink instance lock. Extract the logic of this function into a static function prefixed by `__` to indicate that it is an internal helper function. Modify the original function to be implemented in terms of the new locked function. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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