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virtio-scsi: Fix build with gcc 9

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Build fails with gcc 9:

  CC      ppc64-softmmu/hw/scsi/virtio-scsi.o
hw/scsi/virtio-scsi.c: In function ‘virtio_scsi_do_tmf’:
hw/scsi/virtio-scsi.c:265:39: error: taking address of packed member of ‘struct virtio_scsi_ctrl_tmf_req’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
  265 |     virtio_tswap32s(VIRTIO_DEVICE(s), &req->req.tmf.subtype);
      |                                       ^~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

All the fields in struct virtio_scsi_ctrl_tmf_req are naturally aligned,
so we could in theory drop QEMU_PACKED. Unfortunately, the header file
is imported from linux which already has the packed attribute. Trying to
fix that in the update-linux-headers.sh script is likely to produce
ugliness. Turn the call to virtio_tswap32s() into an assignment instead.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <155137678223.44753.5438092367451176318.stgit@bahia.lan>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Greg Kurz
2019-03-11 16:33:49 +01:00
committed by Paolo Bonzini
parent f24c3a79a4
commit d804232dc4
1 changed files with 7 additions and 1 deletions
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hw/scsi/virtio-scsi.c
+7 -1
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@@ -262,7 +262,13 @@ static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
req->resp.tmf.response = VIRTIO_SCSI_S_OK;
virtio_tswap32s(VIRTIO_DEVICE(s), &req->req.tmf.subtype);
/*
* req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
* to avoid compiler errors.
*/
req->req.tmf.subtype =
virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
switch (req->req.tmf.subtype) {
case VIRTIO_SCSI_T_TMF_ABORT_TASK:
case VIRTIO_SCSI_T_TMF_QUERY_TASK: