linux-kernel - [PATCH 5.12 024/296] s390/dasd: add missing discipline function

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Date:   Mon, 31 May 2021 15:11:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Stefan Haberland <sth@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.12 024/296] s390/dasd: add missing discipline function

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

commit c0c8a8397fa8a74d04915f4d3d28cb4a5d401427 upstream.

Fix crash with illegal operation exception in dasd_device_tasklet.
Commit b72949328869 ("s390/dasd: Prepare for additional path event handling")
renamed the verify_path function for ECKD but not for FBA and DIAG.
This leads to a panic when the path verification function is called for a
FBA or DIAG device.

Fix by defining a wrapper function for dasd_generic_verify_path().

Fixes: b72949328869 ("s390/dasd: Prepare for additional path event handling")
Cc: <stable@...r.kernel.org> #5.11
Reviewed-by: Jan Hoeppner <hoeppner@...ux.ibm.com>
Signed-off-by: Stefan Haberland <sth@...ux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Link: https://lore.kernel.org/r/20210525125006.157531-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/s390/block/dasd_diag.c |    8 +++++++-
 drivers/s390/block/dasd_fba.c  |    8 +++++++-
 drivers/s390/block/dasd_int.h  |    1 -
 3 files changed, 14 insertions(+), 3 deletions(-)

--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -642,12 +642,18 @@ static void dasd_diag_setup_blk_queue(st
 	blk_queue_segment_boundary(q, PAGE_SIZE - 1);
 }
 
+static int dasd_diag_pe_handler(struct dasd_device *device,
+				__u8 tbvpm, __u8 fcsecpm)
+{
+	return dasd_generic_verify_path(device, tbvpm);
+}
+
 static struct dasd_discipline dasd_diag_discipline = {
 	.owner = THIS_MODULE,
 	.name = "DIAG",
 	.ebcname = "DIAG",
 	.check_device = dasd_diag_check_device,
-	.verify_path = dasd_generic_verify_path,
+	.pe_handler = dasd_diag_pe_handler,
 	.fill_geometry = dasd_diag_fill_geometry,
 	.setup_blk_queue = dasd_diag_setup_blk_queue,
 	.start_IO = dasd_start_diag,
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -800,13 +800,19 @@ static void dasd_fba_setup_blk_queue(str
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 }
 
+static int dasd_fba_pe_handler(struct dasd_device *device,
+			       __u8 tbvpm, __u8 fcsecpm)
+{
+	return dasd_generic_verify_path(device, tbvpm);
+}
+
 static struct dasd_discipline dasd_fba_discipline = {
 	.owner = THIS_MODULE,
 	.name = "FBA ",
 	.ebcname = "FBA ",
 	.check_device = dasd_fba_check_characteristics,
 	.do_analysis = dasd_fba_do_analysis,
-	.verify_path = dasd_generic_verify_path,
+	.pe_handler = dasd_fba_pe_handler,
 	.setup_blk_queue = dasd_fba_setup_blk_queue,
 	.fill_geometry = dasd_fba_fill_geometry,
 	.start_IO = dasd_start_IO,
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -297,7 +297,6 @@ struct dasd_discipline {
 	 * e.g. verify that new path is compatible with the current
 	 * configuration.
 	 */
-	int (*verify_path)(struct dasd_device *, __u8);
 	int (*pe_handler)(struct dasd_device *, __u8, __u8);
 
 	/*