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scsi: target: core: Do not overwrite CDB byte 1 

passthrough_parse_cdb() - used by TCMU and PSCSI - attepts to reset the LUN
field of SCSI-2 CDBs (bits 5,6,7 of byte 1).  The current code is wrong as
for newer commands not having the LUN field it overwrites relevant command
bits (e.g. for SECURITY PROTOCOL IN / OUT). We think this code was
unnecessary from the beginning or at least it is no longer useful. So we
remove it entirely.

Link: https://lore.kernel.org/r/12498eab-76fd-eaad-1316-c2827badb76a@ts.fujitsu.com
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bodo Stroesser 2019-10-14 20:29:04 +02:00 committed by Martin K. Petersen
parent 6a0990eaa7
commit 27e84243cb
1 changed files with 0 additions and 21 deletions
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21
drivers/target/target_core_device.c
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@ -1074,27 +1074,6 @@ passthrough_parse_cdb(struct se_cmd *cmd,
struct se_device *dev = cmd->se_dev;
unsigned int size;
/*
* Clear a lun set in the cdb if the initiator talking to use spoke
* and old standards version, as we can't assume the underlying device
* won't choke up on it.
*/
switch (cdb[0]) {
case READ_10: /* SBC - RDProtect */
case READ_12: /* SBC - RDProtect */
case READ_16: /* SBC - RDProtect */
case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
case VERIFY: /* SBC - VRProtect */
case VERIFY_16: /* SBC - VRProtect */
case WRITE_VERIFY: /* SBC - VRProtect */
case WRITE_VERIFY_12: /* SBC - VRProtect */
case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
break;
default:
cdb[1] &= 0x1f; /* clear logical unit number */
break;
}
/*
* For REPORT LUNS we always need to emulate the response, for everything
* else, pass it up.