Patch "s390/dasd: fix wrongly assigned configuration data" has been added to the 4.9-stable tree

Patch "s390/dasd: fix wrongly assigned configuration data" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    s390/dasd: fix wrongly assigned configuration data

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     s390-dasd-fix-wrongly-assigned-configuration-data.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb 28 16:13:29 CET 2018
From: Stefan Haberland <sth@linux.vnet.ibm.com>
Date: Wed, 6 Dec 2017 10:30:39 +0100
Subject: s390/dasd: fix wrongly assigned configuration data

From: Stefan Haberland <sth@linux.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@linux.vnet.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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
@@ -2755,6 +2755,16 @@ 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,


Patches currently in stable-queue which might be from sth@linux.vnet.ibm.com are

queue-4.9/s390-dasd-fix-wrongly-assigned-configuration-data.patch