linux-kernel - [PATCH 4.4 018/135] scsi: ibmvscsi: Don't send host info in adapter info MAD after LPM

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Message-Id: <20200629155309.2495516-19-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:51:12 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tyrel Datwyler <tyreld@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 018/135] scsi: ibmvscsi: Don't send host info in adapter info MAD after LPM

From: Tyrel Datwyler <tyreld@...ux.ibm.com>

[ Upstream commit 4919b33b63c8b69d8dcf2b867431d0e3b6dc6d28 ]

The adapter info MAD is used to send the client info and receive the host
info as a response. A persistent buffer is used and as such the client info
is overwritten after the response. During the course of a normal adapter
reset the client info is refreshed in the buffer in preparation for sending
the adapter info MAD.

However, in the special case of LPM where we reenable the CRQ instead of a
full CRQ teardown and reset we fail to refresh the client info in the
adapter info buffer. As a result, after Live Partition Migration (LPM) we
erroneously report the host's info as our own.

[mkp: typos]

Link: https://lore.kernel.org/r/20200603203632.18426-1-tyreld@linux.ibm.com
Signed-off-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ibmvscsi/ibmvscsi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index e26747a1b35a1..e7075aae15daa 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -427,6 +427,8 @@ static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
 	int rc = 0;
 	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

+	set_adapter_info(hostdata);
+
 	/* Re-enable the CRQ */
 	do {
 		if (rc)
-- 
2.25.1