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bh=CrmoymnzAgikECEklmSg1XDyOEymdcxw7MwzoWGtGiE=; b=DLkgxbhPcWFVQRy6uEze9XKSmoTsiOzeMgMzJCdb916QekZoZSyCmGF+h0Rv4EGS7FZE6h AJSra2xPg0K43QvrJNZWpdVdYgaOXRcDV6fQcuXxNSHKRuz6vcVA7kdXgUlk/q2nINUuF8 8MKsEFyRNo+lslVvjwQQx8pJ3Q4RvOk= X-MC-Unique: zT8-JcTDM4eeWXsS17Ovow-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PATCH v8 09/17] scsi/scsi_bus: switch search direction in scsi_device_find Date: Wed, 7 Oct 2020 07:56:52 -0400 Message-Id: <20201007115700.707938-10-pbonzini@redhat.com> In-Reply-To: <20201007115700.707938-1-pbonzini@redhat.com> References: <20201007115700.707938-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Maxim Levitsky 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 channe= l, int id, int lun) BusChild *kid; SCSIDevice *target_dev =3D NULL; =20 - QTAILQ_FOREACH_REVERSE(kid, &bus->qbus.children, sibling) { + QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) { DeviceState *qdev =3D kid->child; SCSIDevice *dev =3D SCSI_DEVICE(qdev); =20 @@ -1580,7 +1580,15 @@ SCSIDevice *scsi_device_find(SCSIBus *bus, int chann= el, int id, int lun) if (dev->lun =3D=3D lun) { return dev; } - target_dev =3D 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 =3D dev; + } } } return target_dev; --=20 2.26.2