File scsi-scsi_bus-switch-search-direction-in.patch of Package qemu.30221
From: Maxim Levitsky <mlevitsk@redhat.com>
Date: Tue, 6 Oct 2020 14:38:57 +0200
Subject: scsi/scsi_bus: switch search direction in scsi_device_find
Git-commit: 7a8202c521a5d1ac9e289d5c2b5125a9310af178
References: bsc#1184574
This change will allow us to convert the bus children list to RCU,
while not changing the logic of this function
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200913160259.32145-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Lin Ma <lma@suse.com>
---
hw/scsi/scsi-bus.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index ad0e7f6d8895690fefbaa4207816..4f277985f64be532c8151a0ac09b 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1584,7 +1584,7 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
BusChild *kid;
SCSIDevice *target_dev = NULL;
- QTAILQ_FOREACH_REVERSE(kid, &bus->qbus.children, sibling) {
+ QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
DeviceState *qdev = kid->child;
SCSIDevice *dev = SCSI_DEVICE(qdev);
@@ -1592,7 +1592,15 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
if (dev->lun == lun) {
return dev;
}
- target_dev = dev;
+
+ /*
+ * If we don't find exact match (channel/bus/lun),
+ * we will return the first device which matches channel/bus
+ */
+
+ if (!target_dev) {
+ target_dev = dev;
+ }
}
}
return target_dev;