tree a0f28c864a88bdba3b294e6d8bf5409e078f93c8
parent ddbd8325f53a29200d512e018d0a456cb0942ead
author Paul Crowley <paulcrowley@google.com> 1540940364 -0700
committer Paul Crowley <paulcrowley@google.com> 1541455148 -0800

Wait for dm device to be ready before format

It can sometimes take a moment for the dm-device to appear after
creation, causing operations on it such as formatting to fail.
Ensure the device exists before create_crypto_blk_dev returns.

Test: adb sm set-virtual-disk true and format as adoptable.
Bug: 117586466
Change-Id: Id8f571b551f50fc759e78d917e4ac3080e926722
Merged-In: Id8f571b551f50fc759e78d917e4ac3080e926722