[PATCH v9 19/21] blockjob: protect iostatus field in BlockJob struct

[Emanuele Giuseppe Esposito]

iostatus is the only field (together with .job) that needs
protection using the job mutex.

It is set in the main loop (GLOBAL_STATE functions) but read
in I/O code (block_job_error_action).

In order to protect it, change block_job_iostatus_set_err
to block_job_iostatus_set_err_locked(), always called under
job lock.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
 blockjob.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/blockjob.c b/blockjob.c
index a2559b97a7..893c8ff08e 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -367,7 +367,8 @@ BlockJobInfo *block_job_query(BlockJob *job, Error **errp)
     return block_job_query_locked(job, errp);
 }
 
-static void block_job_iostatus_set_err(BlockJob *job, int error)
+/* Called with job lock held */
+static void block_job_iostatus_set_err_locked(BlockJob *job, int error)
 {
     if (job->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
         job->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
@@ -586,8 +587,8 @@ BlockErrorAction block_job_error_action(BlockJob *job, 
BlockdevOnError on_err,
                  */
                 job->job.user_paused = true;
             }
+            block_job_iostatus_set_err_locked(job, error);
         }
-        block_job_iostatus_set_err(job, error);
     }
     return action;
 }
-- 
2.31.1