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NVMe: Simplify device resume on io queue failure 

Releasing IO queues and disks was done in a work queue outside the
controller resume context to delete namespaces if the controller failed
after a resume from suspend. This is unnecessary since we can resume
a device asynchronously.

This patch makes resume use probe_work so it can directly remove
namespaces if the device is manageable but not IO capable. Since the
deleting disks was the only reason we had the convoluted "reset_workfn",
this patch removes that unnecessary indirection.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-10-02 10:37:29 -06:00 committed by Jens Axboe
parent 5105aa555c
commit 0a7385ad69
2 changed files with 6 additions and 29 deletions
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34
drivers/block/nvme-core.c
View File

@ -1285,7 +1285,6 @@ static void nvme_abort_req(struct request *req)
list_del_init(&dev->node);
dev_warn(dev->dev, "I/O %d QID %d timeout, reset controller\n",
req->tag, nvmeq->qid);
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
out:
spin_unlock_irqrestore(&dev_list_lock, flags);
@ -2089,7 +2088,6 @@ static int nvme_kthread(void *data)
dev_warn(dev->dev,
"Failed status: %x, reset controller\n",
readl(&dev->bar->csts));
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
continue;
}
@ -3025,14 +3023,6 @@ static int nvme_remove_dead_ctrl(void *arg)
return 0;
}
static void nvme_remove_disks(struct work_struct *ws)
{
struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work);
nvme_free_queues(dev, 1);
nvme_dev_remove(dev);
}
static int nvme_dev_resume(struct nvme_dev *dev)
{
int ret;
@ -3041,10 +3031,9 @@ static int nvme_dev_resume(struct nvme_dev *dev)
if (ret)
return ret;
if (dev->online_queues < 2) {
spin_lock(&dev_list_lock);
dev->reset_workfn = nvme_remove_disks;
queue_work(nvme_workq, &dev->reset_work);
spin_unlock(&dev_list_lock);
dev_warn(dev->dev, "IO queues not created\n");
nvme_free_queues(dev, 1);
nvme_dev_remove(dev);
} else {
nvme_unfreeze_queues(dev);
nvme_dev_add(dev);
@ -3091,12 +3080,6 @@ static void nvme_reset_failed_dev(struct work_struct *ws)
nvme_dev_reset(dev);
}
static void nvme_reset_workfn(struct work_struct *work)
{
struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work);
dev->reset_workfn(work);
}
static int nvme_reset(struct nvme_dev *dev)
{
int ret = -EBUSY;
@ -3106,7 +3089,6 @@ static int nvme_reset(struct nvme_dev *dev)
spin_lock(&dev_list_lock);
if (!work_pending(&dev->reset_work)) {
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
ret = 0;
}
@ -3159,8 +3141,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto free;
INIT_LIST_HEAD(&dev->namespaces);
dev->reset_workfn = nvme_reset_failed_dev;
INIT_WORK(&dev->reset_work, nvme_reset_workfn);
INIT_WORK(&dev->reset_work, nvme_reset_failed_dev);
dev->dev = get_device(&pdev->dev);
pci_set_drvdata(pdev, dev);
result = nvme_set_instance(dev);
@ -3223,7 +3204,7 @@ static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
if (prepare)
nvme_dev_shutdown(dev);
else
nvme_dev_resume(dev);
schedule_work(&dev->probe_work);
}
static void nvme_shutdown(struct pci_dev *pdev)
@ -3277,10 +3258,7 @@ static int nvme_resume(struct device *dev)
struct pci_dev *pdev = to_pci_dev(dev);
struct nvme_dev *ndev = pci_get_drvdata(pdev);
if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) {
ndev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &ndev->reset_work);
}
schedule_work(&ndev->probe_work);
return 0;
}
#endif

1
include/linux/nvme.h
View File

@ -104,7 +104,6 @@ struct nvme_dev {
struct list_head namespaces;
struct kref kref;
struct device *device;
work_func_t reset_workfn;
struct work_struct reset_work;
struct work_struct probe_work;
struct work_struct scan_work;