[PATCH 4.19 062/120] nvme-pci: do not call nvme_dev_remove_admin from nvme_remove

Greg Kroah-Hartman
2021-07-26T16:01:42Z

From: Casey Chen <cachen@purestorage.com>

[ Upstream commit 251ef6f71be2adfd09546a26643426fe62585173 ]

nvme_dev_remove_admin could free dev->admin_q and the admin_tagset
while they are being accessed by nvme_dev_disable(), which can be called
by nvme_reset_work via nvme_remove_dead_ctrl.

Commit cb4bfda62afa ("nvme-pci: fix hot removal during error handling")
intended to avoid requests being stuck on a removed controller by killing
the admin queue. But the later fix c8e9e9b7646e ("nvme-pci: unquiesce
admin queue on shutdown"), together with nvme_dev_disable(dev, true)
right before nvme_dev_remove_admin() could help dispatch requests and
fail them early, so we don't need nvme_dev_remove_admin() any more.

Fixes: cb4bfda62afa ("nvme-pci: fix hot removal during error handling")
Signed-off-by: Casey Chen <cachen@purestorage.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/nvme/host/pci.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 82d87d2e280c..8f1f10fa0dd6 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2605,7 +2605,6 @@ static void nvme_remove(struct pci_dev *pdev)
if (!pci_device_is_present(pdev)) {
nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
nvme_dev_disable(dev, true);
- nvme_dev_remove_admin(dev);
}

flush_work(&dev->ctrl.reset_work);
--
2.30.2