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virtio-scsi: Fix build with gcc 9
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>
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@ -262,7 +262,13 @@ static int virtio_scsi_do_tmf(VirtIOSCSI *s, VirtIOSCSIReq *req)
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/* Here VIRTIO_SCSI_S_OK means "FUNCTION COMPLETE". */
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req->resp.tmf.response = VIRTIO_SCSI_S_OK;
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virtio_tswap32s(VIRTIO_DEVICE(s), &req->req.tmf.subtype);
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/*
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* req->req.tmf has the QEMU_PACKED attribute. Don't use virtio_tswap32s()
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* to avoid compiler errors.
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*/
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req->req.tmf.subtype =
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virtio_tswap32(VIRTIO_DEVICE(s), req->req.tmf.subtype);
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switch (req->req.tmf.subtype) {
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case VIRTIO_SCSI_T_TMF_ABORT_TASK:
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case VIRTIO_SCSI_T_TMF_QUERY_TASK:
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