Il 10/06/2013 03:40, Hannes Reinecke ha scritto:
> Any TMF might be take longer as expected, or not return at all.
> So we need to use 'wait_for_completion_timeout' when sending
> a TMF to protect against these cases.
>
> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
> ---
> drivers/scsi/virtio_scsi.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index 1efd219..abfc684 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -30,6 +30,7 @@
> #define VIRTIO_SCSI_MEMPOOL_SZ 64
> #define VIRTIO_SCSI_EVENT_LEN 8
> #define VIRTIO_SCSI_VQ_BASE 2
> +#define VIRTIO_SCSI_TMF_TIMEOUT 30
>
> /* Command queue element */
> struct virtio_scsi_cmd {
> @@ -597,8 +598,10 @@ static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
> GFP_NOIO) < 0)
> goto out;
>
> - wait_for_completion(&comp);
> - if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK ||
> + if (wait_for_completion_timeout(&comp,
> + VIRTIO_SCSI_TMF_TIMEOUT * HZ) == 0)
> + ret = FAILED;
> + else if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK ||
> cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
> ret = SUCCESS;
>
>
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
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