linux-kernel - [PATCH 4.4 17/34] s390/dasd: fix wrongly assigned configuration data

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Date:   Fri,  2 Mar 2018 09:51:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefan Haberland <sth@...ux.vnet.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 17/34] s390/dasd: fix wrongly assigned configuration data

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

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

From: Stefan Haberland <sth@...ux.vnet.ibm.com>


[ Upstream commit 8a9bd4f8ebc6800bfc0596e28631ff6809a2f615 ]

We store per path and per device configuration data to identify the
path or device correctly. The per path configuration data might get
mixed up if the original request gets into error recovery and is
started with a random path mask.

This would lead to a wrong identification of a path in case of a CUIR
event for example.

Fix by copying the path mask from the original request to the error
recovery request in case it is a path verification request.

Signed-off-by: Stefan Haberland <sth@...ux.vnet.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@...ux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/s390/block/dasd_3990_erp.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -2743,6 +2743,16 @@ dasd_3990_erp_action(struct dasd_ccw_req
 		erp = dasd_3990_erp_handle_match_erp(cqr, erp);
 	}
 
+
+	/*
+	 * For path verification work we need to stick with the path that was
+	 * originally chosen so that the per path configuration data is
+	 * assigned correctly.
+	 */
+	if (test_bit(DASD_CQR_VERIFY_PATH, &erp->flags) && cqr->lpm) {
+		erp->lpm = cqr->lpm;
+	}
+
 	if (device->features & DASD_FEATURE_ERPLOG) {
 		/* print current erp_chain */
 		dev_err(&device->cdev->dev,