tree 02309897b69a9ea76f5c57bba3f2e72a01de16eb
parent 53752414eab95d31d76db4bb088ac1d5499b5aae
author Alex Klyubin <klyubin@google.com> 1435098111 -0700
committer Alex Klyubin <klyubin@google.com> 1435098951 -0700

Abort operation pruning only if it fails to make space.

keystore service's begin operation may sometimes encounter a situation
where the underlying device's begin operation fails because of too
many operations in progress. In that case, keystore attempts to prune
the oldest pruneable operation by invoking the underlying device's
abort operation. Regardless of whether the abort operation fails,
keystore then removes the operation from the list of in-progress
prunable operations.

The issue is that when the underlying device's abort operation fails,
keystore fails the begin operation that caused all this prunining.
This is despite the fact that keystore has managed to make space for
one more operation.

The fix is to fail the begin operation only if the pruning attempt
did not make space for a a new operation.

Bug: 22040842
Change-Id: Id98b2c6690de3cfb2a7b1d3bdd10742cc59ecbfa