linux-kernel - [PATCH] mpt3sas: Fix for block device of raid exists even after deleting raid disk

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Message-Id: <1477565186-13970-1-git-send-email-Sreekanth.Reddy@broadcom.com>
Date:   Thu, 27 Oct 2016 16:16:26 +0530
From:   Sreekanth Reddy <sreekanth.reddy@...adcom.com>
To:     JBottomley@...allels.com, jejb@...nel.org, hch@...radead.org
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        Sathya.Prakash@...adcom.com, linux-kernel@...r.kernel.org,
        suganath-prabu.subramani@...adcom.com,
        chaitra.basappa@...adcom.com,
        Sreekanth Reddy <Sreekanth.Reddy@...adcom.com>
Subject: [PATCH] mpt3sas: Fix for block device of raid exists even after deleting raid disk

While merging mpt3sas & mpt2sas code, we posted below patch for WarpDrive
support,

mpt3sas: Ported WarpDrive product SSS6200 support
commit id is 7786ab6aff

In this patch and in the below hunk, we have added is_warpdrive
check condition on the wrong line
---------------------------------------------------------------------------
 scsih_target_alloc(struct scsi_target *starget)
                        sas_target_priv_data->handle = raid_device->handle;
                        sas_target_priv_data->sas_address = raid_device->wwid;
                        sas_target_priv_data->flags |= MPT_TARGET_FLAGS_VOLUME;
-                       raid_device->starget = starget;
+                       sas_target_priv_data->raid_device = raid_device;
+                       if (ioc->is_warpdrive)
+                               raid_device->starget = starget;
                }
                spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
                return 0;
------------------------------------------------------------------------------

Actually that check should be for below line
 sas_target_priv_data->raid_device = raid_device;

Due to above hunk, we are not initializing raid_device's starget for raid volumes,
and so during raid disk deletion driver is not calling scsi_remove_target() API as
driver observes starget field of raid_device's structure as NULL.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@...adcom.com>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 981be7b..618c9df8 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -1279,9 +1279,9 @@ scsih_target_alloc(struct scsi_target *starget)
 			sas_target_priv_data->handle = raid_device->handle;
 			sas_target_priv_data->sas_address = raid_device->wwid;
 			sas_target_priv_data->flags |= MPT_TARGET_FLAGS_VOLUME;
-			sas_target_priv_data->raid_device = raid_device;
 			if (ioc->is_warpdrive)
-				raid_device->starget = starget;
+				sas_target_priv_data->raid_device = raid_device;
+			raid_device->starget = starget;
 		}
 		spin_unlock_irqrestore(&ioc->raid_device_lock, flags);
 		return 0;
-- 
2.4.3