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nvme: don't use PREPARE_WORK 

PREPARE_[DELAYED_]WORK() are being phased out.  They have few users
and a nasty surprise in terms of reentrancy guarantee as workqueue
considers work items to be different if they don't have the same work
function.

nvme_dev->reset_work is multiplexed with multiple work functions.
Introduce nvme_reset_workfn() which invokes nvme_dev->reset_workfn and
always use it as the work function and update the users to set the
->reset_workfn field instead of overriding the work function using
PREPARE_WORK().

It would probably be best to route this with other related updates
through the workqueue tree.

Compile tested.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: linux-nvme@lists.infradead.org
This commit is contained in:
Tejun Heo 2014-03-07 10:24:49 -05:00
parent 77fa83cf74
commit 9ca9737444
2 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/block/nvme-core.c
View File

@ -993,7 +993,7 @@ static void nvme_abort_cmd(int cmdid, struct nvme_queue *nvmeq)
dev_warn(&dev->pci_dev->dev,
"I/O %d QID %d timeout, reset controller\n", cmdid,
nvmeq->qid);
PREPARE_WORK(&dev->reset_work, nvme_reset_failed_dev);
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
return;
}
@ -1696,8 +1696,7 @@ static int nvme_kthread(void *data)
list_del_init(&dev->node);
dev_warn(&dev->pci_dev->dev,
"Failed status, reset controller\n");
PREPARE_WORK(&dev->reset_work,
nvme_reset_failed_dev);
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
continue;
}
@ -2406,7 +2405,7 @@ static int nvme_dev_resume(struct nvme_dev *dev)
return ret;
if (ret == -EBUSY) {
spin_lock(&dev_list_lock);
PREPARE_WORK(&dev->reset_work, nvme_remove_disks);
dev->reset_workfn = nvme_remove_disks;
queue_work(nvme_workq, &dev->reset_work);
spin_unlock(&dev_list_lock);
}
@ -2435,6 +2434,12 @@ 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_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
int result = -ENOMEM;
@ -2453,7 +2458,8 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto free;
INIT_LIST_HEAD(&dev->namespaces);
INIT_WORK(&dev->reset_work, nvme_reset_failed_dev);
dev->reset_workfn = nvme_reset_failed_dev;
INIT_WORK(&dev->reset_work, nvme_reset_workfn);
dev->pci_dev = pdev;
pci_set_drvdata(pdev, dev);
result = nvme_set_instance(dev);
@ -2553,7 +2559,7 @@ static int nvme_resume(struct device *dev)
struct nvme_dev *ndev = pci_get_drvdata(pdev);
if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) {
PREPARE_WORK(&ndev->reset_work, nvme_reset_failed_dev);
ndev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &ndev->reset_work);
}
return 0;

1
include/linux/nvme.h
View File

@ -87,6 +87,7 @@ struct nvme_dev {
struct list_head namespaces;
struct kref kref;
struct miscdevice miscdev;
work_func_t reset_workfn;
struct work_struct reset_work;
char name[12];
char serial[20];