[PATCH] nvme-apple: drop invalid put of admin queue reference count

[Fedor Pchelkin]

Commit 03b3bcd319b3 ("nvme: fix admin request_queue lifetime") moved the
admin queue reference ->put call into nvme_free_ctrl() - a controller
device release callback performed for every nvme driver doing
nvme_init_ctrl().

nvme-apple sets refcount of the admin queue to 1 at allocation during the
probe function and then puts it twice now:

nvme_free_ctrl()
  blk_put_queue(ctrl->admin_q) // #1
  ->free_ctrl()
    apple_nvme_free_ctrl()
      blk_put_queue(anv->ctrl.admin_q) // #2

Note that there is a commit 941f7298c70c ("nvme-apple: remove an extra
queue reference") which intended to drop having an extra admin queue
reference.  Looks like at that moment it accidentally fixed a refcount
leak, which existed since the driver's introduction.  There were an
initial ->set and an extra ->get call at driver's probe function, and only
a single ->put inside apple_nvme_free_ctrl().

However now after commit 03b3bcd319b3 ("nvme: fix admin request_queue
lifetime") the refcount is imbalanced again.  Fix it by removing extra
->put call from apple_nvme_free_ctrl().  Compile tested only.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 03b3bcd319b3 ("nvme: fix admin request_queue lifetime")
Cc: stable at vger.kernel.org # depends on 941f7298c70c
Signed-off-by: Fedor Pchelkin <pchelkin at ispras.ru>
---

Also nvme-apple seems not to have a blk_mq_destroy_queue() call for
admin queue since introduction - if it's needed, the proper place would
be in apple_nvme_remove() just before calling nvme_uninit_ctrl(), I guess?

 drivers/nvme/host/apple.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index ed61b97fde59..1d82f0541b0b 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1269,8 +1269,6 @@ static void apple_nvme_free_ctrl(struct nvme_ctrl *ctrl)
 {
 	struct apple_nvme *anv = ctrl_to_apple_nvme(ctrl);
 
-	if (anv->ctrl.admin_q)
-		blk_put_queue(anv->ctrl.admin_q);
 	put_device(anv->dev);
 }
 
-- 
2.53.0