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nvme-pci: refactor the tagset handling in nvme_reset_work

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The code to create, update or delete a tagset and namespaces in
nvme_reset_work is a bit convoluted.  Refactor it with a two high-level
conditionals for first probe vs reset and I/O queues vs no I/O queues
to make the code flow more clear.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221101150050.3510-3-hch@lst.de
[axboe: fix whitespace issue]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-11-01 16:00:38 +01:00 committed by Jens Axboe
parent 71b26083d5
commit 0ffc7e98bf
1 changed files with 29 additions and 17 deletions
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46
drivers/nvme/host/pci.c
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@ -2898,24 +2898,36 @@ static void nvme_reset_work(struct work_struct *work)
if (result)
goto out;
/*
* Keep the controller around but remove all namespaces if we don't have
* any working I/O queue.
*/
if (dev->online_queues < 2) {
dev_warn(dev->ctrl.device, "IO queues not created\n");
nvme_kill_queues(&dev->ctrl);
nvme_remove_namespaces(&dev->ctrl);
nvme_free_tagset(dev);
} else {
nvme_start_queues(&dev->ctrl);
nvme_wait_freeze(&dev->ctrl);
if (!dev->ctrl.tagset)
nvme_pci_alloc_tag_set(dev);
else
if (dev->ctrl.tagset) {
/*
* This is a controller reset and we already have a tagset.
* Freeze and update the number of I/O queues as thos might have
* changed. If there are no I/O queues left after this reset,
* keep the controller around but remove all namespaces.
*/
if (dev->online_queues > 1) {
nvme_start_queues(&dev->ctrl);
nvme_wait_freeze(&dev->ctrl);
nvme_pci_update_nr_queues(dev);
nvme_dbbuf_set(dev);
nvme_unfreeze(&dev->ctrl);
nvme_dbbuf_set(dev);
nvme_unfreeze(&dev->ctrl);
} else {
dev_warn(dev->ctrl.device, "IO queues lost\n");
nvme_kill_queues(&dev->ctrl);
nvme_remove_namespaces(&dev->ctrl);
nvme_free_tagset(dev);
}
} else {
/*
* First probe. Still allow the controller to show up even if
* there are no namespaces.
*/
if (dev->online_queues > 1) {
nvme_pci_alloc_tag_set(dev);
nvme_dbbuf_set(dev);
} else {
dev_warn(dev->ctrl.device, "IO queues not created\n");
}
}
/*