scsi-bus: fix unmatched object_unref()

Fix commit 391dd8f1("scsi-bus: Refactor the code that retries requests"),
which split scsi_dma_restart_bh(), but the object_unref() belongs to
scsi_dma_restart_bh().
So, we should mv object_unref() from scsi_retry_requests() to
scsi_dma_restart_bh().

Signed-off-by: Yan Wang <wangyan122@huawei.com>

scsi-bus-fix-unmatched-object_unref.patch

@@ -0,0 +1,42 @@
+From 239ffdcf42e0795b5f025f87fa19ce01642811f2 Mon Sep 17 00:00:00 2001
+From: Yan Wang <wangyan122@huawei.com>
+Date: Tue, 1 Mar 2022 20:12:12 +0800
+Subject: [PATCH] scsi-bus: fix unmatched object_unref()
+
+Fix commit 391dd8f1("scsi-bus: Refactor the code that retries requests"),
+which split scsi_dma_restart_bh(), but the object_unref() belongs to
+scsi_dma_restart_bh().
+So, we should mv object_unref() from scsi_retry_requests() to
+scsi_dma_restart_bh().
+
+Signed-off-by: Yan Wang <wangyan122@huawei.com>
+---
+ hw/scsi/scsi-bus.c | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
+index 5e6f891b9d..9d37f490ce 100644
+--- a/hw/scsi/scsi-bus.c
++++ b/hw/scsi/scsi-bus.c
+@@ -166,8 +166,6 @@ void scsi_retry_requests(SCSIDevice *s)
+         scsi_req_unref(req);
+     }
+     aio_context_release(blk_get_aio_context(s->conf.blk));
+-    /* Drop the reference that was acquired in scsi_dma_restart_cb */
+-    object_unref(OBJECT(s));
+ }
+ 
+ static void scsi_dma_restart_bh(void *opaque)
+@@ -178,6 +176,9 @@ static void scsi_dma_restart_bh(void *opaque)
+     s->bh = NULL;
+ 
+     scsi_retry_requests(s);
++
++    /* Drop the reference that was acquired in scsi_dma_restart_cb */
++    object_unref(OBJECT(s));
+ }
+ 
+ void scsi_req_retry(SCSIRequest *req)
+-- 
+2.27.0
+