From 081f5e753c9c4cd1dd86000bcc7f5fe14cbdcab0 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Tue, 12 Jul 2022 08:16:32 -0700 Subject: [PATCH 1/2] nvme-pci: fix freeze accounting for error handling A reset on a live device experiencing a link error still needs to have the queue freeze state started for the subsequent reinitialization. Skip only the register read if the device is not present instead of bypassing the freeze checks. Fixes: b98235d3a471e ("nvme-pci: harden drive presence detect in nvme_dev_disable()") Reported-by: Niklas Schnelle Signed-off-by: Keith Busch Tested-by: Niklas Schnelle Signed-off-by: Christoph Hellwig --- drivers/nvme/host/pci.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 193b44755662..58c72d55769a 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2690,8 +2690,13 @@ static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) struct pci_dev *pdev = to_pci_dev(dev->dev); mutex_lock(&dev->shutdown_lock); - if (pci_device_is_present(pdev) && pci_is_enabled(pdev)) { - u32 csts = readl(dev->bar + NVME_REG_CSTS); + if (pci_is_enabled(pdev)) { + u32 csts; + + if (pci_device_is_present(pdev)) + csts = readl(dev->bar + NVME_REG_CSTS); + else + csts = ~0; if (dev->ctrl.state == NVME_CTRL_LIVE || dev->ctrl.state == NVME_CTRL_RESETTING) { From 6961b5e02876b3b47f030a1f1ee8fd3e631ac270 Mon Sep 17 00:00:00 2001 From: Israel Rukshin Date: Thu, 14 Jul 2022 12:42:10 +0000 Subject: [PATCH 2/2] nvme: fix block device naming collision The issue exists when multipath is enabled and the namespace is shared, but all the other controller checks at nvme_is_unique_nsid() are false. The reason for this issue is that nvme_is_unique_nsid() returns false when is called from nvme_mpath_alloc_disk() due to an uninitialized value of head->shared. The patch fixes it by setting head->shared before nvme_mpath_alloc_disk() is called. Fixes: 5974ea7ce0f9 ("nvme: allow duplicate NSIDs for private namespaces") Signed-off-by: Israel Rukshin Reviewed-by: Keith Busch Reviewed-by: Max Gurtovoy Signed-off-by: Christoph Hellwig --- drivers/nvme/host/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index ec6ac298d8de..6a12a906a11e 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3786,7 +3786,7 @@ static int nvme_add_ns_cdev(struct nvme_ns *ns) } static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, - unsigned nsid, struct nvme_ns_ids *ids) + unsigned nsid, struct nvme_ns_ids *ids, bool is_shared) { struct nvme_ns_head *head; size_t size = sizeof(*head); @@ -3810,6 +3810,7 @@ static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, head->subsys = ctrl->subsys; head->ns_id = nsid; head->ids = *ids; + head->shared = is_shared; kref_init(&head->ref); if (head->ids.csi) { @@ -3891,12 +3892,11 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, nsid); goto out_unlock; } - head = nvme_alloc_ns_head(ctrl, nsid, ids); + head = nvme_alloc_ns_head(ctrl, nsid, ids, is_shared); if (IS_ERR(head)) { ret = PTR_ERR(head); goto out_unlock; } - head->shared = is_shared; } else { ret = -EINVAL; if (!is_shared || !head->shared) {