[PATCH AUTOSEL 4.19 10/27] nvme-pci: Fix async probe remove race

[Sasha Levin]

From: Keith Busch <kbu...@kernel.org>

[ Upstream commit bd46a90634302bfe791e93ad5496f98f165f7ae0 ]

Ensure the controller is not in the NEW state when nvme_probe() exits.
This will always allow a subsequent nvme_remove() to set the state to
DELETING, fixing a potential race between the initial asynchronous probe
and device removal.

Reported-by: Li Zhong <lizhon...@gmail.com>
Reviewed-by: Sagi Grimberg <s...@grimberg.me>
Signed-off-by: Keith Busch <kbu...@kernel.org>
Signed-off-by: Sagi Grimberg <s...@grimberg.me>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nvme/host/pci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 0a5d064f82ca3..a64a8bca0d5b9 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2468,7 +2468,7 @@ static void nvme_async_probe(void *data, async_cookie_t 
cookie)
 {
        struct nvme_dev *dev = data;
 
-       nvme_reset_ctrl_sync(&dev->ctrl);
+       flush_work(&dev->ctrl.reset_work);
        flush_work(&dev->ctrl.scan_work);
        nvme_put_ctrl(&dev->ctrl);
 }
@@ -2535,6 +2535,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct 
pci_device_id *id)
 
        dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
 
+       nvme_reset_ctrl(&dev->ctrl);
        nvme_get_ctrl(&dev->ctrl);
        async_schedule(nvme_async_probe, dev);
 
-- 
2.20.1