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Subject[PATCH AUTOSEL 5.2 17/44] nvme-pci: Fix async probe remove race
Date
From: Keith Busch <kbusch@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 <lizhongfs@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Sasha Levin <sashal@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 f9959eaaa185e..09ffd21d18096 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2712,7 +2712,7 @@ 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);
}
@@ -2778,6 +2778,7 @@ 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
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