linux-kernel - [PATCH AUTOSEL 4.19 086/158] nvme-pci: properly report state change failure in nvme_reset

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Date:   Mon, 15 Jul 2019 10:16:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Minwoo Im <minwoo.im.dev@...il.com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 086/158] nvme-pci: properly report state change failure in nvme_reset_work

From: Minwoo Im <minwoo.im.dev@...il.com>

[ Upstream commit cee6c269b016ba89c62e34d6bccb103ee2c7de4f ]

If the state change to NVME_CTRL_CONNECTING fails, the dmesg is going to
be like:

  [  293.689160] nvme nvme0: failed to mark controller CONNECTING
  [  293.689160] nvme nvme0: Removing after probe failure status: 0

Even it prints the first line to indicate the situation, the second line
is not proper because the status is 0 which means normally success of
the previous operation.

This patch makes it indicate the proper error value when it fails.
  [   25.932367] nvme nvme0: failed to mark controller CONNECTING
  [   25.932369] nvme nvme0: Removing after probe failure status: -16

This situation is able to be easily reproduced by:
  root@...get:~# rmmod nvme && modprobe nvme && rmmod nvme

Signed-off-by: Minwoo Im <minwoo.im.dev@...il.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index c8eeecc58115..03e72e2f57f5 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2294,6 +2294,7 @@ static void nvme_reset_work(struct work_struct *work)
 	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_CONNECTING)) {
 		dev_warn(dev->ctrl.device,
 			"failed to mark controller CONNECTING\n");
+		result = -EBUSY;
 		goto out;
 	}
 
-- 
2.20.1