[RFC PATCH v2 14/19] scsi: mpt3sas: Add param to control LUN based error handle

[Wenchao Hao]

Add new module param lun_eh to control if enable LUN based
error handler, since mpt3sas defined callback eh_host_reset
and eh_target_reset, so make it fallback to further recover
when LUN based recovery can not recover all error commands.

Signed-off-by: Wenchao Hao <haowenchao2@xxxxxxxxxx>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index c3c1f466fe01..7a48e89c3e5d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -174,6 +174,10 @@ module_param(host_tagset_enable, int, 0444);
 MODULE_PARM_DESC(host_tagset_enable,
 	"Shared host tagset enable/disable Default: enable(1)");
 
+static bool lun_eh;
+module_param(lun_eh, bool, 0444);
+MODULE_PARM_DESC(lun_eh, "LUN based error handle (def=0)");
+
 /* raid transport support */
 static struct raid_template *mpt3sas_raid_template;
 static struct raid_template *mpt2sas_raid_template;
@@ -2044,6 +2048,13 @@ scsih_slave_alloc(struct scsi_device *sdev)
 	struct _sas_device *sas_device;
 	struct _pcie_device *pcie_device;
 	unsigned long flags;
+	int ret = 0;
+
+	if (lun_eh) {
+		ret = scsi_device_setup_eh(sdev, 1);
+		if (ret)
+			return ret;
+	}
 
 	sas_device_priv_data = kzalloc(sizeof(*sas_device_priv_data),
 				       GFP_KERNEL);
@@ -2122,6 +2133,9 @@ scsih_slave_destroy(struct scsi_device *sdev)
 	struct _pcie_device *pcie_device;
 	unsigned long flags;
 
+	if (lun_eh)
+		scsi_device_clear_eh(sdev);
+
 	if (!sdev->hostdata)
 		return;
 
-- 
2.35.3