From d12537df343ec21054769f59bda3b15879644f52 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 4 Apr 2017 16:12:24 -0700 Subject: [PATCH] nfp: add mutex protection for the port list We will want to unregister netdevs after their port got reconfigured. For that we need to make sure manipulations of port list from the port reconfiguration flow will not race with driver's .remove() callback. Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/nfp_main.c | 3 +-- drivers/net/ethernet/netronome/nfp/nfp_main.h | 3 +++ drivers/net/ethernet/netronome/nfp/nfp_net_main.c | 19 +++++++++++++++++-- 3 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c index dedac72..9626679 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_main.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c @@ -385,8 +385,7 @@ static void nfp_pci_remove(struct pci_dev *pdev) { struct nfp_pf *pf = pci_get_drvdata(pdev); - if (!list_empty(&pf->ports)) - nfp_net_pci_remove(pf); + nfp_net_pci_remove(pf); nfp_pcie_sriov_disable(pdev); diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.h b/drivers/net/ethernet/netronome/nfp/nfp_main.h index bb15a57..b7ceec9 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_main.h +++ b/drivers/net/ethernet/netronome/nfp/nfp_main.h @@ -42,6 +42,7 @@ #include #include #include +#include #include struct dentry; @@ -67,6 +68,7 @@ struct nfp_eth_table; * @num_ports: Number of adapter ports app firmware supports * @num_netdevs: Number of netdevs spawned * @ports: Linked list of port structures (struct nfp_net) + * @port_lock: Protects @ports, @num_ports, @num_netdevs */ struct nfp_pf { struct pci_dev *pdev; @@ -92,6 +94,7 @@ struct nfp_pf { unsigned int num_netdevs; struct list_head ports; + struct mutex port_lock; }; extern struct pci_driver nfp_netvf_pci_driver; diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c index 1644954..4d602b1 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c @@ -481,17 +481,22 @@ int nfp_net_pci_probe(struct nfp_pf *pf) int stride; int err; + mutex_init(&pf->port_lock); + /* Verify that the board has completed initialization */ if (!nfp_is_ready(pf->cpp)) { nfp_err(pf->cpp, "NFP is not ready for NIC operation.\n"); return -EINVAL; } + mutex_lock(&pf->port_lock); pf->num_ports = nfp_net_pf_get_num_ports(pf); ctrl_bar = nfp_net_pf_map_ctrl_bar(pf); - if (!ctrl_bar) - return pf->fw_loaded ? -EINVAL : -EPROBE_DEFER; + if (!ctrl_bar) { + err = pf->fw_loaded ? -EINVAL : -EPROBE_DEFER; + goto err_unlock; + } nfp_net_get_fw_version(&fw_ver, ctrl_bar); if (fw_ver.resv || fw_ver.class != NFP_NET_CFG_VERSION_CLASS_GENERIC) { @@ -565,6 +570,8 @@ int nfp_net_pci_probe(struct nfp_pf *pf) if (err) goto err_clean_ddir; + mutex_unlock(&pf->port_lock); + return 0; err_clean_ddir: @@ -574,6 +581,8 @@ err_unmap_tx: nfp_cpp_area_release_free(pf->tx_area); err_ctrl_unmap: nfp_cpp_area_release_free(pf->ctrl_area); +err_unlock: + mutex_unlock(&pf->port_lock); return err; } @@ -581,6 +590,10 @@ void nfp_net_pci_remove(struct nfp_pf *pf) { struct nfp_net *nn; + mutex_lock(&pf->port_lock); + if (list_empty(&pf->ports)) + goto out; + list_for_each_entry(nn, &pf->ports, port_list) { nfp_net_debugfs_dir_clean(&nn->debugfs_dir); @@ -597,4 +610,6 @@ void nfp_net_pci_remove(struct nfp_pf *pf) nfp_cpp_area_release_free(pf->rx_area); nfp_cpp_area_release_free(pf->tx_area); nfp_cpp_area_release_free(pf->ctrl_area); +out: + mutex_unlock(&pf->port_lock); } -- 2.7.4