From: Christof Schmitt <christof.schmitt@xxxxxxxxxx> The smatch tool from http://repo.or.cz/w/smatch.git warns about this: drivers/s390/scsi/zfcp_scsi.c +64 zfcp_scsi_command_fail(5) warn: variable dereferenced before check 'scpnt->device' drivers/s390/scsi/zfcp_scsi.c +64 zfcp_scsi_command_fail(5) warn: variable dereferenced before check 'scpnt->device->host' drivers/s390/scsi/zfcp_scsi.c +93 zfcp_scsi_queuecommand(23) warn: variable dereferenced before check 'unit' Fix the first two warnings by removing the checks for scpnt->device and -> host: As long as the SCSI command exists, there is also a scsi_device and a Scsi_Host. Fix the last warning by removing the BUG_ON checks in zfcp_scsi_queuecommand, they are leftovers from previous paranoia about wrong pointers between data structures. Reviewed-by: Swen Schillig <swen@xxxxxxxxxxxx> Signed-off-by: Christof Schmitt <christof.schmitt@xxxxxxxxxx> --- drivers/s390/scsi/zfcp_scsi.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff -urpN linux-2.6/drivers/s390/scsi/zfcp_scsi.c linux-2.6-patched/drivers/s390/scsi/zfcp_scsi.c --- linux-2.6/drivers/s390/scsi/zfcp_scsi.c 2010-02-16 09:43:29.000000000 +0100 +++ linux-2.6-patched/drivers/s390/scsi/zfcp_scsi.c 2010-02-16 09:43:30.000000000 +0100 @@ -60,10 +60,9 @@ static void zfcp_scsi_command_fail(struc { struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; + set_host_byte(scpnt, result); - if ((scpnt->device != NULL) && (scpnt->device->host != NULL)) - zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL); - /* return directly */ + zfcp_dbf_scsi_result("fail", 4, adapter->dbf, scpnt, NULL); scpnt->scsi_done(scpnt); } @@ -87,14 +86,6 @@ static int zfcp_scsi_queuecommand(struct adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; unit = scpnt->device->hostdata; - BUG_ON(!adapter || (adapter != unit->port->adapter)); - BUG_ON(!scpnt->scsi_done); - - if (unlikely(!unit)) { - zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT); - return 0; - } - scsi_result = fc_remote_port_chkready(rport); if (unlikely(scsi_result)) { scpnt->result = scsi_result; -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
