s390/dasd: add missing discipline function

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@vger.kernel.org> #5.11
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/r/20210525125006.157531-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 1b9e1442e6a50f003efabc4977bdae8899399cf3..fd42a5fffaed1bc2c8e76918f397820a1a93e394 100644 (file)
--- 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(struct dasd_block *block)
        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,

diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 4789410885e4fba8b8d9e6acf7f1a14d70a6a7bb..3ad319aee51edb470b970ce8dad903ab30cb954c 100644 (file)
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -794,13 +794,19 @@ static void dasd_fba_setup_blk_queue(struct dasd_block *block)
        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,

diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 1c59b0e86a9f073a82831c68cd4259f2a988de20..155428bfed8ac12b3c4d9b7da1af6752c827173b 100644 (file)
--- 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);
 
        /*