This is a note to let you know that I've just added the patch titled
nvme: Fix managing degraded controllers
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: nvme-fix-managing-degraded-controllers.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From keith.busch@intel.com Thu Feb 15 15:28:13 2018
From: Keith Busch keith.busch@intel.com Date: Tue, 13 Feb 2018 09:19:37 -0700 Subject: nvme: Fix managing degraded controllers To: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Linux NVMe linux-nvme@lists.infradead.org, stable@vger.kernel.org Message-ID: 20180213161936.GE20962@localhost.localdomain Content-Disposition: inline
From: Keith Busch keith.busch@intel.com
commit 5bae7f73d378a986 upstream
Upstream is a near rewrite of the async nvme probe that ultimately didn't even cleanly merge in 4.5. This patch is a much smaller change targeted to the regression introduced in 4.4.
If a controller is in a degraded mode that needs admin assistence to recover, we need to leave the controller running. We just want to disable namespace access without shuting the controller down.
Fixes: 3cf519b5a8d4("nvme: merge nvme_dev_start, nvme_dev_resume and nvme_async_probe")
Signed-off-by: Keith Busch keith.busch@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/nvme/host/pci.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2976,10 +2976,16 @@ static void nvme_dev_shutdown(struct nvm mutex_unlock(&dev->shutdown_lock); }
-static void nvme_dev_remove(struct nvme_dev *dev) +static void nvme_remove_namespaces(struct nvme_dev *dev) { struct nvme_ns *ns, *next;
+ list_for_each_entry_safe(ns, next, &dev->namespaces, list) + nvme_ns_remove(ns); +} + +static void nvme_dev_remove(struct nvme_dev *dev) +{ if (nvme_io_incapable(dev)) { /* * If the device is not capable of IO (surprise hot-removal, @@ -2989,8 +2995,7 @@ static void nvme_dev_remove(struct nvme_ */ nvme_dev_shutdown(dev); } - list_for_each_entry_safe(ns, next, &dev->namespaces, list) - nvme_ns_remove(ns); + nvme_remove_namespaces(dev); }
static int nvme_setup_prp_pools(struct nvme_dev *dev) @@ -3174,7 +3179,7 @@ static void nvme_probe_work(struct work_ */ if (dev->online_queues < 2) { dev_warn(dev->dev, "IO queues not created\n"); - nvme_dev_remove(dev); + nvme_remove_namespaces(dev); } else { nvme_unfreeze_queues(dev); nvme_dev_add(dev);
Patches currently in stable-queue which might be from keith.busch@intel.com are
queue-4.4/nvme-fix-managing-degraded-controllers.patch