[PATCH 2/2] NVMe: Synchronize resets with scan work
Keith Busch
keith.busch at intel.com
Tue May 31 12:49:08 PDT 2016
A user could continuously reset a controller, which aborts active
commands. If the controller is currently scanning live namespaces, the
aborted commands could cause namespaces to fail. This patch synchronizes
the reset on a live controller with namespace scanning work to prevent
this from occuring.
Reported-by: Ming Lin <mlin at kernel.org>
Signed-off-by: Keith Busch <keith.busch at intel.com>
---
drivers/nvme/host/pci.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index dfb8f2a..7c4e194 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1781,10 +1781,13 @@ static void nvme_reset_work(struct work_struct *work)
/*
* If we're called to reset a live controller first shut it down before
- * moving on.
+ * moving on. Synchronize with controller scanning so a user can't
+ * interrupt and fail active namespace validation.
*/
- if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
+ if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) {
+ flush_work(&dev->ctrl.scan_work);
nvme_dev_disable(dev, false);
+ }
result = nvme_pci_enable(dev);
if (result)
--
2.7.2
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