[PATCH][SRU][J] nvdimm/pmem: cleanup the disk if pmem_release_disk() is yet assigned

[Koba Ko]

From: Luis Chamberlain <mcgrof at kernel.org>

BugLink: https://bugs.launchpad.net/bugs/1958850 

Prior to devm being able to use pmem_release_disk() there are other
failure which can occur for which we must account for and release the
disk for. Address those few cases.

Fixes: 3dd60fb9d95d ("nvdimm/pmem: stop using q_usage_count as external pgmap refcount")
Reviewed-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Luis Chamberlain <mcgrof at kernel.org>
Link: https://lore.kernel.org/r/20211103230437.1639990-6-mcgrof@kernel.org
Signed-off-by: Jens Axboe <axboe at kernel.dk>
(cherry picked from commit accf58afb689f81daadde24080ea1164ad2db75f)
Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 drivers/nvdimm/pmem.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index f576ee0ce7968..f8f1baf0d0625 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -430,8 +430,10 @@ static int pmem_attach_disk(struct device *dev,
 		bb_range.end = res->end;
 	}
 
-	if (IS_ERR(addr))
-		return PTR_ERR(addr);
+	if (IS_ERR(addr)) {
+		rc = PTR_ERR(addr);
+		goto out;
+	}
 	pmem->virt_addr = addr;
 
 	blk_queue_write_cache(q, true, fua);
@@ -456,7 +458,8 @@ static int pmem_attach_disk(struct device *dev,
 		flags = DAXDEV_F_SYNC;
 	dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags);
 	if (IS_ERR(dax_dev)) {
-		return PTR_ERR(dax_dev);
+		rc = PTR_ERR(dax_dev);
+		goto out;
 	}
 	dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
 	pmem->dax_dev = dax_dev;
@@ -473,8 +476,10 @@ static int pmem_attach_disk(struct device *dev,
 					  "badblocks");
 	if (!pmem->bb_state)
 		dev_warn(dev, "'badblocks' notification disabled\n");
-
 	return 0;
+out:
+	blk_cleanup_disk(pmem->disk);
+	return rc;
 }
 
 static int nd_pmem_probe(struct device *dev)
-- 
2.25.1