test-blockjob: Acquire AioContext around job_cancel_sync()

All callers in QEMU proper hold the AioContext lock when calling
job_finish_sync(). test-blockjob should do the same when it calls the
function indirectly through job_cancel_sync().
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NFam Zheng <famz@redhat.com>

include/qemu/job.h

@@ -524,6 +524,8 @@ void job_user_cancel(Job *job, bool force, Error **errp);
  *
  * Returns the return value from the job if the job actually completed
  * during the call, or -ECANCELED if it was canceled.
+ *
+ * Callers must hold the AioContext lock of job->aio_context.
  */
 int job_cancel_sync(Job *job);
 
@@ -541,6 +543,8 @@ void job_cancel_sync_all(void);
  * function).
  *
  * Returns the return value from the job.
+ *
+ * Callers must hold the AioContext lock of job->aio_context.
  */
 int job_complete_sync(Job *job, Error **errp);
 
@@ -566,6 +570,8 @@ void job_dismiss(Job **job, Error **errp);
  *
  * Returns 0 if the job is successfully completed, -ECANCELED if the job was
  * cancelled before completing, and -errno in other error cases.
+ *
+ * Callers must hold the AioContext lock of job->aio_context.
  */
 int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp);
 

tests/test-blockjob.c

@@ -223,6 +223,10 @@ static void cancel_common(CancelJob *s)
     BlockJob *job = &s->common;
     BlockBackend *blk = s->blk;
     JobStatus sts = job->job.status;
+    AioContext *ctx;
+
+    ctx = job->job.aio_context;
+    aio_context_acquire(ctx);
 
     job_cancel_sync(&job->job);
     if (sts != JOB_STATUS_CREATED && sts != JOB_STATUS_CONCLUDED) {
@@ -232,6 +236,8 @@ static void cancel_common(CancelJob *s)
     assert(job->job.status == JOB_STATUS_NULL);
     job_unref(&job->job);
     destroy_blk(blk);
+
+    aio_context_release(ctx);
 }
 
 static void test_cancel_created(void)