[PATCH v3 13/14] isci: remove bus and reset handlers

Dan Williams
2012-01-06T01:00:07Z

Remove ->eh_device_reset_handler() and ->eh_bus_reset_handler() for the
same reason they are not implemented for libata hosts, they cannot be
implemented reliably with ata-eh. ATA error recovery wants to divert
all resets to the eh thread and wait for completion, these handlers may
be invoked from a non-blocking ioctl.

The other path they are called from is libsas-eh, and if we escalate
past I_T_nexus reset we have larger problems i.e. tear down all
in-flight commands in the domain potentially without notification to the
lldd if it has chosen not to implement ->lldd_clear_nexus_port() /
->lldd_clear_nexus_ha().

Cc: Jack Wang <jack_wang@usish.com>
Cc: Xiangliang Yu <yuxiangl@marvell.com>
Cc: Luben Tuikov <ltuikov@yahoo.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/scsi/isci/init.c | 2 --
drivers/scsi/isci/task.c | 23 -----------------------
drivers/scsi/isci/task.h | 2 --
3 files changed, 0 insertions(+), 27 deletions(-)

diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 40293b3..437f76b 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -157,8 +157,6 @@ static struct scsi_host_template isci_sht = {
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
- .eh_device_reset_handler = sas_eh_device_reset_handler,
- .eh_bus_reset_handler = isci_bus_reset_handler,
.slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index 48df8e5..edaba78 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -1322,26 +1322,3 @@ int isci_task_I_T_nexus_reset(struct domain_device *dev)
isci_put_device(idev);
return ret;
}
-
-int isci_bus_reset_handler(struct scsi_cmnd *cmd)
-{
- struct domain_device *dev = sdev_to_domain_dev(cmd->device);
- struct isci_host *ihost = dev_to_ihost(dev);
- struct isci_remote_device *idev;
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&ihost->scic_lock, flags);
- idev = isci_lookup_device(dev);
- spin_unlock_irqrestore(&ihost->scic_lock, flags);
-
- if (!idev) {
- ret = TMF_RESP_FUNC_COMPLETE;
- goto out;
- }
-
- ret = isci_reset_device(ihost, dev, idev);
- out:
- isci_put_device(idev);
- return ret;
-}
diff --git a/drivers/scsi/isci/task.h b/drivers/scsi/isci/task.h
index 8ffcdc9..7bc6fd6 100644
--- a/drivers/scsi/isci/task.h
+++ b/drivers/scsi/isci/task.h
@@ -209,8 +209,6 @@ int isci_queuecommand(
struct scsi_cmnd *scsi_cmd,
void (*donefunc)(struct scsi_cmnd *));

-int isci_bus_reset_handler(struct scsi_cmnd *cmd);
-
/**
* enum isci_completion_selection - This enum defines the possible actions to
* take with respect to a given request's notification back to libsas.