From edbdb0d94143db46edd373cc93e433832d29fe19 Mon Sep 17 00:00:00 2001 From: Miroslav Franc Date: Fri, 9 Feb 2024 13:45:22 +0100 Subject: [PATCH] s390/dasd: fix double module refcount decrement MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Upstream commit c3116e62ddeff79cae342147753ce596f01fcf06 ] Once the discipline is associated with the device, deleting the device takes care of decrementing the module's refcount. Doing it manually on this error path causes refcount to artificially decrease on each error while it should just stay the same. Fixes: c020d722b110 ("s390/dasd: fix panic during offline processing") Signed-off-by: Miroslav Franc Signed-off-by: Jan Höppner Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20240209124522.3697827-3-sth@linux.ibm.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/s390/block/dasd.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index f13f76fe3f2e..fc3347427111 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -3573,12 +3573,11 @@ int dasd_generic_set_online(struct ccw_device *cdev, dasd_delete_device(device); return -EINVAL; } + device->base_discipline = base_discipline; if (!try_module_get(discipline->owner)) { - module_put(base_discipline->owner); dasd_delete_device(device); return -EINVAL; } - device->base_discipline = base_discipline; device->discipline = discipline; /* check_device will allocate block device if necessary */ @@ -3586,8 +3585,6 @@ int dasd_generic_set_online(struct ccw_device *cdev, if (rc) { dev_warn(dev, "Setting the DASD online with discipline %s failed with rc=%i\n", discipline->name, rc); - module_put(discipline->owner); - module_put(base_discipline->owner); dasd_delete_device(device); return rc; }