linux-kernel - [PATCH 3.18 081/183] Revert "[SCSI] mpt2sas: Remove phys on topology change."

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Message-Id: <20150125180813.702657026@linuxfoundation.org>
Date:	Sun, 25 Jan 2015 10:06:43 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>,
	Tomas Henzl <thenzl@...hat.com>, Christoph Hellwig <hch@....de>
Subject: [PATCH 3.18 081/183] Revert "[SCSI] mpt2sas: Remove phys on topology change."

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sreekanth Reddy <sreekanth.reddy@...gotech.com>

commit 81a89c2d891b78695aa7e4cc0d5a7427785ae078 upstream.

This reverts commit 3520f9c779bed098ca76dd3fb6377264301d57ed
("mpt2sas: Remove phys on topology change")

Reverting the previous mpt2sas drives patch changes,
since we will observe below issue

Issue:
Drives connected Enclosure/Expander will unregister with
SCSI Transport Layer, if any one remove and add expander
cable with in DMD (Device Missing Delay) time period or
even any one power-off and power-on the Enclosure with in
the DMD period.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@...gotech.com>
Reviewed-by: Tomas Henzl <thenzl@...hat.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/mpt2sas/mpt2sas_transport.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -1006,12 +1006,9 @@ mpt2sas_transport_update_links(struct MP
 		    &mpt2sas_phy->remote_identify);
 		_transport_add_phy_to_an_existing_port(ioc, sas_node,
 		    mpt2sas_phy, mpt2sas_phy->remote_identify.sas_address);
-	} else {
+	} else
 		memset(&mpt2sas_phy->remote_identify, 0 , sizeof(struct
 		    sas_identify));
-		_transport_del_phy_from_an_existing_port(ioc, sas_node,
-		    mpt2sas_phy);
-	}
 
 	if (mpt2sas_phy->phy)
 		mpt2sas_phy->phy->negotiated_linkrate =


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