4.4-stable review patch. If anyone has any objections, please let me know.
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From: Steffen Maier maier@linux.ibm.com
commit 8c3d20aada70042a39c6a6625be037c1472ca610 upstream.
That other commit introduced an inconsistency because it would trace on ERP_FAILED for all callers of port forced reopen triggers (not just terminate_rport_io), but it would not trace on ERP_FAILED for all callers of other ERP triggers such as adapter, port regular, LUN.
Therefore, generalize that other commit. zfcp_erp_action_enqueue() already had two early outs which re-used the one zfcp_dbf_rec_trig() call. All ERP trigger functions finally run through zfcp_erp_action_enqueue(). So move the special handling for ZFCP_STATUS_COMMON_ERP_FAILED into zfcp_erp_action_enqueue() and add another early out with new trace marker for pseudo ERP need in this case. This removes all early returns from all ERP trigger functions so we always end up at zfcp_dbf_rec_trig().
Example trace record formatted with zfcpdbf from s390-tools:
Timestamp : ... Area : REC Subarea : 00 Level : 1 Exception : - CPU ID : .. Caller : 0x... Record ID : 1 ZFCP_DBF_REC_TRIG Tag : ....... LUN : 0x... WWPN : 0x... D_ID : 0x... Adapter status : 0x... Port status : 0x... LUN status : 0x... Ready count : 0x... Running count : 0x... ERP want : 0x0. ZFCP_ERP_ACTION_REOPEN_... ERP need : 0xe0 ZFCP_ERP_ACTION_FAILED
Signed-off-by: Steffen Maier maier@linux.ibm.com Cc: stable@vger.kernel.org #2.6.38+ Reviewed-by: Benjamin Block bblock@linux.ibm.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/s390/scsi/zfcp_erp.c | 79 +++++++++++++++++++++++++++---------------- 1 file changed, 51 insertions(+), 28 deletions(-)
--- a/drivers/s390/scsi/zfcp_erp.c +++ b/drivers/s390/scsi/zfcp_erp.c @@ -142,6 +142,49 @@ static void zfcp_erp_action_dismiss_adap } }
+static int zfcp_erp_handle_failed(int want, struct zfcp_adapter *adapter, + struct zfcp_port *port, + struct scsi_device *sdev) +{ + int need = want; + struct zfcp_scsi_dev *zsdev; + + switch (want) { + case ZFCP_ERP_ACTION_REOPEN_LUN: + zsdev = sdev_to_zfcp(sdev); + if (atomic_read(&zsdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + need = 0; + break; + case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: + if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) + need = 0; + break; + case ZFCP_ERP_ACTION_REOPEN_PORT: + if (atomic_read(&port->status) & + ZFCP_STATUS_COMMON_ERP_FAILED) { + need = 0; + /* ensure propagation of failed status to new devices */ + zfcp_erp_set_port_status( + port, ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + case ZFCP_ERP_ACTION_REOPEN_ADAPTER: + if (atomic_read(&adapter->status) & + ZFCP_STATUS_COMMON_ERP_FAILED) { + need = 0; + /* ensure propagation of failed status to new devices */ + zfcp_erp_set_adapter_status( + adapter, ZFCP_STATUS_COMMON_ERP_FAILED); + } + break; + default: + need = 0; + break; + } + + return need; +} + static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter, struct zfcp_port *port, struct scsi_device *sdev) @@ -265,6 +308,12 @@ static int zfcp_erp_action_enqueue(int w int retval = 1, need; struct zfcp_erp_action *act;
+ need = zfcp_erp_handle_failed(want, adapter, port, sdev); + if (!need) { + need = ZFCP_ERP_ACTION_FAILED; /* marker for trace */ + goto out; + } + if (!adapter->erp_thread) return -EIO;
@@ -313,12 +362,6 @@ static int _zfcp_erp_adapter_reopen(stru zfcp_erp_adapter_block(adapter, clear_mask); zfcp_scsi_schedule_rports_block(adapter);
- /* ensure propagation of failed status to new devices */ - if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { - zfcp_erp_set_adapter_status(adapter, - ZFCP_STATUS_COMMON_ERP_FAILED); - return -EIO; - } return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter, NULL, NULL, id, 0); } @@ -337,12 +380,8 @@ void zfcp_erp_adapter_reopen(struct zfcp zfcp_scsi_schedule_rports_block(adapter);
write_lock_irqsave(&adapter->erp_lock, flags); - if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) - zfcp_erp_set_adapter_status(adapter, - ZFCP_STATUS_COMMON_ERP_FAILED); - else - zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter, - NULL, NULL, id, 0); + zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER, adapter, + NULL, NULL, id, 0); write_unlock_irqrestore(&adapter->erp_lock, flags); }
@@ -383,13 +422,6 @@ static void _zfcp_erp_port_forced_reopen zfcp_erp_port_block(port, clear); zfcp_scsi_schedule_rport_block(port);
- if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { - zfcp_dbf_rec_trig(id, port->adapter, port, NULL, - ZFCP_ERP_ACTION_REOPEN_PORT_FORCED, - ZFCP_ERP_ACTION_FAILED); - return; - } - zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED, port->adapter, port, NULL, id, 0); } @@ -415,12 +447,6 @@ static int _zfcp_erp_port_reopen(struct zfcp_erp_port_block(port, clear); zfcp_scsi_schedule_rport_block(port);
- if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) { - /* ensure propagation of failed status to new devices */ - zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ERP_FAILED); - return -EIO; - } - return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT, port->adapter, port, NULL, id, 0); } @@ -460,9 +486,6 @@ static void _zfcp_erp_lun_reopen(struct
zfcp_erp_lun_block(sdev, clear);
- if (atomic_read(&zfcp_sdev->status) & ZFCP_STATUS_COMMON_ERP_FAILED) - return; - zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_LUN, adapter, zfcp_sdev->port, sdev, id, act_status); }