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nvme/pci: Hold controller reference during async probe 

It is possible the driver's remove may have freed the controller if
the remove callback is invoked prior to the async_schedule starting
the reset_work. This patch fixes that by holding a reference on the
controller.

Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Keith Busch 2018-05-07 08:30:24 -06:00
parent 3831761eb8
commit 80f513b505
1 changed files with 3 additions and 0 deletions
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3
drivers/nvme/host/pci.c
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@ -2492,8 +2492,10 @@ static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
static void nvme_async_probe(void *data, async_cookie_t cookie) static void nvme_async_probe(void *data, async_cookie_t cookie)
{ {
struct nvme_dev *dev = data; struct nvme_dev *dev = data;
nvme_reset_ctrl_sync(&dev->ctrl); nvme_reset_ctrl_sync(&dev->ctrl);
flush_work(&dev->ctrl.scan_work); flush_work(&dev->ctrl.scan_work);
nvme_put_ctrl(&dev->ctrl);
} }
static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
@ -2540,6 +2542,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
nvme_get_ctrl(&dev->ctrl);
async_schedule(nvme_async_probe, dev); async_schedule(nvme_async_probe, dev);
return 0; return 0;