From f6c0e7a7b3b6db15146877c0cef43b413af5b76e Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 2 Aug 2006 11:05:52 +0200 Subject: [SCSI] zfcp: minor erp bug fixes Bug fixes for zfcp's erp: - trigger adapter reopen if do_QDIO fails - avoid erp deadlock if registration of scsi target or remote port hang - do not treat as error if exchange port data fails - decrease timeout for target reset and aborts - mark unit failed if slave_destroy is called Additionally some code cleanup was done: - made some functions void when retval is not of interest - shortened initialization of zfcp's host_template - corrected some comments Signed-off-by: Andreas Herrmann Signed-off-by: James Bottomley --- drivers/s390/scsi/zfcp_scsi.c | 73 ++++++++++++++++++++++--------------------- 1 file changed, 37 insertions(+), 36 deletions(-) (limited to 'drivers/s390/scsi/zfcp_scsi.c') diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index 671f4a6a5d1..1bb55086db9 100644 --- a/drivers/s390/scsi/zfcp_scsi.c +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -30,7 +30,6 @@ static int zfcp_scsi_queuecommand(struct scsi_cmnd *, void (*done) (struct scsi_cmnd *)); static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *); static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *); -static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *); static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *); static int zfcp_task_management_function(struct zfcp_unit *, u8, struct scsi_cmnd *); @@ -46,30 +45,22 @@ struct zfcp_data zfcp_data = { .scsi_host_template = { .name = ZFCP_NAME, .proc_name = "zfcp", - .proc_info = NULL, - .detect = NULL, .slave_alloc = zfcp_scsi_slave_alloc, .slave_configure = zfcp_scsi_slave_configure, .slave_destroy = zfcp_scsi_slave_destroy, .queuecommand = zfcp_scsi_queuecommand, .eh_abort_handler = zfcp_scsi_eh_abort_handler, .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, - .eh_bus_reset_handler = zfcp_scsi_eh_bus_reset_handler, + .eh_bus_reset_handler = zfcp_scsi_eh_host_reset_handler, .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, .can_queue = 4096, .this_id = -1, - /* - * FIXME: - * one less? can zfcp_create_sbale cope with it? - */ .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ, .cmd_per_lun = 1, - .unchecked_isa_dma = 0, .use_clustering = 1, .sdev_attrs = zfcp_sysfs_sdev_attrs, }, .driver_version = ZFCP_VERSION, - /* rest initialised with zeros */ }; /* Find start of Response Information in FCP response unit*/ @@ -176,8 +167,14 @@ zfcp_scsi_slave_alloc(struct scsi_device *sdp) return retval; } -static void -zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) +/** + * zfcp_scsi_slave_destroy - called when scsi device is removed + * + * Remove reference to associated scsi device for an zfcp_unit. + * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs + * or a scan for this device might have failed. + */ +static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) { struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata; @@ -185,6 +182,7 @@ zfcp_scsi_slave_destroy(struct scsi_device *sdpnt) atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status); sdpnt->hostdata = NULL; unit->device = NULL; + zfcp_erp_unit_failed(unit); zfcp_unit_put(unit); } else { ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at " @@ -549,35 +547,38 @@ zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags, } /** - * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter) + * zfcp_scsi_eh_host_reset_handler - handler for host and bus reset + * + * If ERP is already running it will be stopped. */ -int -zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt) +int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) { - struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; - struct zfcp_adapter *adapter = unit->port->adapter; - - ZFCP_LOG_NORMAL("bus reset because of problems with " - "unit 0x%016Lx\n", unit->fcp_lun); - zfcp_erp_adapter_reopen(adapter, 0); - zfcp_erp_wait(adapter); - - return SUCCESS; -} + struct zfcp_unit *unit; + struct zfcp_adapter *adapter; + unsigned long flags; -/** - * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter) - */ -int -zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) -{ - struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata; - struct zfcp_adapter *adapter = unit->port->adapter; + unit = (struct zfcp_unit*) scpnt->device->hostdata; + adapter = unit->port->adapter; - ZFCP_LOG_NORMAL("host reset because of problems with " + ZFCP_LOG_NORMAL("host/bus reset because of problems with " "unit 0x%016Lx\n", unit->fcp_lun); - zfcp_erp_adapter_reopen(adapter, 0); - zfcp_erp_wait(adapter); + + write_lock_irqsave(&adapter->erp_lock, flags); + if (atomic_test_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, + &adapter->status)) { + zfcp_erp_modify_adapter_status(adapter, + ZFCP_STATUS_COMMON_UNBLOCKED|ZFCP_STATUS_COMMON_OPEN, + ZFCP_CLEAR); + zfcp_erp_action_dismiss_adapter(adapter); + write_unlock_irqrestore(&adapter->erp_lock, flags); + zfcp_fsf_req_dismiss_all(adapter); + adapter->fsf_req_seq_no = 0; + zfcp_erp_adapter_reopen(adapter, 0); + } else { + write_unlock_irqrestore(&adapter->erp_lock, flags); + zfcp_erp_adapter_reopen(adapter, 0); + zfcp_erp_wait(adapter); + } return SUCCESS; } -- cgit v1.2.3