From: "Darrick J. Wong" The Quantum GoVault SATAPI removable disk device returns ATA_ERR in response to a REPORT LUNS packet. If this happens to an ATAPI device that is attached to a SAS controller (this is the case with sas_ata), the device does not load because SCSI won't touch a "SCSI device" that won't report its LUNs. Since most ATAPI devices don't support multiple LUNs anyway, we might as well fake a response like we do for ATA devices. Signed-off-by: Darrick J. Wong Signed-off-by: Andrew Morton --- drivers/ata/libata-scsi.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff -puN drivers/ata/libata-scsi.c~libata-simulate-report-luns-for-atapi-devices drivers/ata/libata-scsi.c --- a/drivers/ata/libata-scsi.c~libata-simulate-report-luns-for-atapi-devices +++ a/drivers/ata/libata-scsi.c @@ -2715,8 +2715,13 @@ static inline int __ata_scsi_queuecmd(st rc = ata_scsi_translate(dev, cmd, done, xlat_func); else ata_scsi_simulate(dev, cmd, done); - } else - rc = ata_scsi_translate(dev, cmd, done, atapi_xlat); + } else { + /* Simulate REPORT LUNS for ATAPI devices */ + if (cmd->cmnd[0] == REPORT_LUNS) + ata_scsi_simulate(dev, cmd, done); + else + rc = ata_scsi_translate(dev, cmd, done, atapi_xlat); + } return rc; } _