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[SCSI] zfcp: Fix warnings from smatch 

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@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Christof Schmitt 2010-02-17 11:18:53 +01:00 committed by James Bottomley
parent 67feeebaa7
commit 22ed130719
1 changed files with 2 additions and 11 deletions
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13
drivers/s390/scsi/zfcp_scsi.c
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@ -60,10 +60,9 @@ static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
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 scsi_cmnd *scpnt,
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;