sgutils: allow command which does not transfer any data
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@ -216,11 +216,11 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
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bail!("unknown scsi error - status response {}", status);
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}
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let data_len = self.buffer.len() -
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(unsafe { get_scsi_pt_resid(&*ptvp) } as usize);
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if data_len == 0 {
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bail!("do_scsi_pt failed - no data received");
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let resid = unsafe { get_scsi_pt_resid(&*ptvp) } as usize;
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if resid > self.buffer.len() {
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bail!("do_scsi_pt failed - got strange resid (value too big)");
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}
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let data_len = self.buffer.len() - resid;
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Ok(&self.buffer[..data_len])
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}
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