From: Dan Williams <dan.j.williams@intel.com>
Date: Thu, 8 Dec 2011 08:37:25 +0000 (-0800)
Subject: [SCSI] isci: remove bus and reset handlers
X-Git-Tag: v3.4-rc1~6^2~99
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6a719391e4a13d5fa2ec7642ef0c780d7f3f5716;p=platform%2Fkernel%2Flinux-exynos.git

[SCSI] isci: remove bus and reset handlers

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().

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---

diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c
index 68d9bc2..c3fe39b 100644
--- a/drivers/scsi/isci/init.c
+++ b/drivers/scsi/isci/init.c
@@ -165,8 +165,6 @@ 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 3f04e97..5306979 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 5ba00c3..7b6d0e3 100644
--- a/drivers/scsi/isci/task.h
+++ b/drivers/scsi/isci/task.h
@@ -208,8 +208,6 @@ 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.