On 2017/3/18 7:29, Martin K. Petersen wrote: > Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> writes: > > Kefeng, > >> root@localhost ~]# sg_modes -p 0x2a /dev/sr0 >> QEMU QEMU DVD-ROM 0.15 peripheral_type: cd/dvd [0x5] >> Mode parameter header from MODE SENSE(10): >> Invalid block descriptor length=512, ignore >> Mode data length=36, medium type=0x70, specific param=0x00, longlba=0 >> Block descriptor length=0 >>>> MM capabilities and mechanical status (obsolete), page_control: current >> 00 2a 12 00 00 71 60 29 00 02 c2 00 02 02 00 02 c2 >> 10 00 00 00 00 >> Unexpectedly received extra mode page responses, ignore > > That looks pretty broken. > > Could you try the following patch? The issue still exists, the patch return zero in scsi_mode_sense(), but zero means SAM_STAT_GOOD in scsi_status_is_good(), so n will be still bigger than 512; Thanks,
