From 7a8202c521a5d1ac9e289d5c2b5125a9310af178 Mon Sep 17 00:00:00 2001 From: Maxim Levitsky Date: Tue, 6 Oct 2020 14:38:57 +0200 Subject: [PATCH] scsi/scsi_bus: switch search direction in scsi_device_find 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 Reviewed-by: Stefan Hajnoczi Message-Id: <20200913160259.32145-2-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini --- 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 3284a5d1fb..6b1ed7ae9a 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -1572,7 +1572,7 @@ 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); @@ -1580,7 +1580,15 @@ 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; -- 2.11.4.GIT