linux-kernel - [PATCH] libnvdimm/pmem: Fix pmem_pagemap

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Date:   Tue, 08 Jun 2021 21:37:09 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     axboe@...nel.dk
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-block@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] libnvdimm/pmem: Fix pmem_pagemap_cleanup compile warning

The recent fix to pmem_pagemap_cleanup() to solve a NULL pointer
dereference with the queue_to_disk() helper neglected to remove the @q
variable when queue_to_disk() was replaced.

Drop the conversion of @pgmap to its containing 'struct request_queue'
since pgmap->owner supersedes the need to reference @q.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Fixes: 80b58f4e9f4a ("libnvdimm/pmem: Fix blk_cleanup_disk() usage")
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/pmem.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index fc6b78dd2d24..1e0615b8565e 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -335,8 +335,6 @@ static const struct attribute_group *pmem_attribute_groups[] = {
 
 static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap)
 {
-	struct request_queue *q =
-		container_of(pgmap->ref, struct request_queue, q_usage_counter);
 	struct pmem_device *pmem = pgmap->owner;
 
 	blk_cleanup_disk(pmem->disk);