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[PATCH v2 1/3] backup: don't acquire aio_context in backup_clean

From: Stefan Reiter
Subject: [PATCH v2 1/3] backup: don't acquire aio_context in backup_clean
Date: Thu, 26 Mar 2020 16:56:26 +0100

All code-paths leading to backup_clean (via job_clean) have the job's
context already acquired. The job's context is guaranteed to be the same
as the one used by backup_top via backup_job_create.

Since the previous logic effectively acquired the lock twice, this
broke cleanup of backups for disks using IO threads, since the BDRV_POLL_WHILE
in bdrv_backup_top_drop -> bdrv_do_drained_begin would only release the lock
once, thus deadlocking with the IO thread.

This is a partial revert of 0abf2581717a19.

Signed-off-by: Stefan Reiter <address@hidden>
 block/backup.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/block/backup.c b/block/backup.c
index 7430ca5883..a7a7dcaf4c 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -126,11 +126,7 @@ static void backup_abort(Job *job)
 static void backup_clean(Job *job)
     BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
-    AioContext *aio_context = bdrv_get_aio_context(s->backup_top);
-    aio_context_acquire(aio_context);
-    aio_context_release(aio_context);
 void backup_do_checkpoint(BlockJob *job, Error **errp)

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