diff options
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 6963d529e0f0..18486b51668d 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -573,6 +573,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, /* Each pass gets up to three chances to ignore Unit Attention */ for (count = 0; count < 3; ++count) { + int resid; + memset(scsi_cmd, 0, 6); scsi_cmd[0] = INQUIRY; scsi_cmd[4] = (unsigned char) try_inquiry_len; @@ -582,7 +584,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, inq_result, try_inquiry_len, &sshdr, HZ / 2 + HZ * scsi_inq_timeout, 3, - NULL); + &resid); SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " "with code 0x%x\n", @@ -603,6 +605,14 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, (sshdr.ascq == 0)) continue; } + } else { + /* + * if nothing was transferred, we try + * again. It's a workaround for some USB + * devices. + */ + if (resid == try_inquiry_len) + continue; } break; } |