storvsc: be more picky about scmnd->sc_data_direction
Under the 'default' case in scmnd->sc_data_direction we have 3 options: - DMA_NONE which we handle correctly. - DMA_BIDIRECTIONAL which is never supposed to be set by SCSI stack. - Garbage value. Do WARN() and return -EINVAL in the last two cases. virtio_scsi does BUG_ON() here but it looks like an overkill. Reported-by: NRadim Krčmář <rkrcmar@redhat.com> Signed-off-by: NVitaly Kuznetsov <vkuznets@redhat.com> Acked-by: NK. Y. Srinivasan <kys@microsoft.com> Signed-off-by: NJames Bottomley <JBottomley@Odin.com>
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