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Commit 5c8809e6 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

nvme: remove dead controllers from a work item 



Compared to the kthread this gives us multiple call prevention for free.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent fd634f41

drivers/nvme/host/pci.c

+9 −13
Original line number Diff line number Diff line
@@ -80,7 +80,7 @@ struct nvme_iod; 
static int nvme_reset(struct nvme_dev *dev);

static void nvme_process_cq(struct nvme_queue *nvmeq);

static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod);

static void nvme_dead_ctrl(struct nvme_dev *dev);

static void nvme_remove_dead_ctrl(struct nvme_dev *dev);

static void nvme_dev_shutdown(struct nvme_dev *dev);



struct async_cmd_info {
@@ -113,6 +113,7 @@ struct nvme_dev { 
	void __iomem *bar;

	struct work_struct reset_work;

	struct work_struct scan_work;

	struct work_struct remove_work;

	struct mutex shutdown_lock;

	bool subsystem;

	void __iomem *cmb;
@@ -2218,32 +2219,26 @@ static void nvme_reset_work(struct work_struct *work) 
 unmap:

	nvme_dev_unmap(dev);

 out:

	if (!work_pending(&dev->reset_work))

		nvme_dead_ctrl(dev);

	nvme_remove_dead_ctrl(dev);

}



static int nvme_remove_dead_ctrl(void *arg)

static void nvme_remove_dead_ctrl_work(struct work_struct *work)

{

	struct nvme_dev *dev = (struct nvme_dev *)arg;

	struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);

	struct pci_dev *pdev = to_pci_dev(dev->dev);



	if (pci_get_drvdata(pdev))

		pci_stop_and_remove_bus_device_locked(pdev);

	nvme_put_ctrl(&dev->ctrl);

	return 0;

}



static void nvme_dead_ctrl(struct nvme_dev *dev)

static void nvme_remove_dead_ctrl(struct nvme_dev *dev)

{

	dev_warn(dev->dev, "Device failed to resume\n");

	dev_warn(dev->dev, "Removing after probe failure\n");

	kref_get(&dev->ctrl.kref);

	if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d",

						dev->ctrl.instance))) {

		dev_err(dev->dev,

			"Failed to start controller remove task\n");

	if (!schedule_work(&dev->remove_work))

		nvme_put_ctrl(&dev->ctrl);

}

}



static int nvme_reset(struct nvme_dev *dev)

{
@@ -2323,6 +2318,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
	INIT_LIST_HEAD(&dev->node);

	INIT_WORK(&dev->scan_work, nvme_dev_scan);

	INIT_WORK(&dev->reset_work, nvme_reset_work);

	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);

	mutex_init(&dev->shutdown_lock);



	result = nvme_setup_prp_pools(dev);