Messages in this thread | | | Subject | The kernel may clear part of my vendor-specific SCSI command. | From | Yu-Ming Chang 張育銘 <> | Date | Mon, 6 Apr 2009 17:07:46 +0800 |
| |
Dear Linux developers,
I'm using CentOS 5.2(kernel-2.6.18) to control a specific USB massive storage device. When I send a vendor-spcific SCSI command to the device like this:
unsigned char scsi_cmd[16]; sg_io_hdr_t io_hdr; scsi_cmd[0] = 0xf1; scsi_cmd[1] = 0xff; io_hdr.cmdp = scsi_cmd;
the device receives a command with scsi_cmd[1] = 0x1f. I think the first of three bits of second byte of io_hdr.cmdp are cleared by kernel.
Does anyone have some clues or hints? I wish you can CC to my mailbox when you respond to my posting.
Regards, Chang Yu-ming
| |