net/mlx4_core: Preserve pci_dev_data after __mlx4_remove_one()

pci_match_id() just match the static pci_device_id, which may return NULL if
someone binds the driver to a device manually using
/sys/bus/pci/drivers/.../new_id.

This patch wrap up a helper function __mlx4_remove_one() which does the tear
down function but preserve the drv_data. Functions like
mlx4_pci_err_detected() and mlx4_restart_one() will call this one with out
releasing drvdata.

Fixes: 97a5221 "net/mlx4_core: pass pci_device_id.driver_data to __mlx4_init_one during reset".

CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Amir Vadai <amirv@mellanox.com>
CC: Jack Morgenstein <jackm@dev.mellanox.co.il>
CC: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index f0ae95f66cebe27bd306d64001cc516ff41b4554..4b86c7af2a7a929134fdfa7b6dd6e0142fe7693e 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -2301,13 +2301,8 @@ static int __mlx4_init_one(struct pci_dev *pdev, int pci_dev_data)
        /* Allow large DMA segments, up to the firmware limit of 1 GB */
        dma_set_max_seg_size(&pdev->dev, 1024 * 1024 * 1024);
 
-       priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-       if (!priv) {
-               err = -ENOMEM;
-               goto err_release_regions;
-       }
-
-       dev       = &priv->dev;
+       dev       = pci_get_drvdata(pdev);
+       priv      = mlx4_priv(dev);
        dev->pdev = pdev;
        INIT_LIST_HEAD(&priv->ctx_list);
        spin_lock_init(&priv->ctx_lock);
@@ -2535,8 +2530,7 @@ slave_start:
        mlx4_sense_init(dev);
        mlx4_start_sense(dev);
 
-       priv->pci_dev_data = pci_dev_data;
-       pci_set_drvdata(pdev, dev);
+       priv->removed = 0;
 
        return 0;
 
@@ -2604,85 +2598,109 @@ err_disable_pdev:
 
 static int mlx4_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
+       struct mlx4_priv *priv;
+       struct mlx4_dev *dev;
+
        printk_once(KERN_INFO "%s", mlx4_version);
 
+       priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       dev       = &priv->dev;
+       pci_set_drvdata(pdev, dev);
+       priv->pci_dev_data = id->driver_data;
+
        return __mlx4_init_one(pdev, id->driver_data);
 }
 
-static void mlx4_remove_one(struct pci_dev *pdev)
+static void __mlx4_remove_one(struct pci_dev *pdev)
 {
        struct mlx4_dev  *dev  = pci_get_drvdata(pdev);
        struct mlx4_priv *priv = mlx4_priv(dev);
+       int               pci_dev_data;
        int p;
 
-       if (dev) {
-               /* in SRIOV it is not allowed to unload the pf's
-                * driver while there are alive vf's */
-               if (mlx4_is_master(dev)) {
-                       if (mlx4_how_many_lives_vf(dev))
-                               printk(KERN_ERR "Removing PF when there are assigned VF's !!!\n");
-               }
-               mlx4_stop_sense(dev);
-               mlx4_unregister_device(dev);
+       if (priv->removed)
+               return;
 
-               for (p = 1; p <= dev->caps.num_ports; p++) {
-                       mlx4_cleanup_port_info(&priv->port[p]);
-                       mlx4_CLOSE_PORT(dev, p);
-               }
+       pci_dev_data = priv->pci_dev_data;
 
-               if (mlx4_is_master(dev))
-                       mlx4_free_resource_tracker(dev,
-                                                  RES_TR_FREE_SLAVES_ONLY);
-
-               mlx4_cleanup_counters_table(dev);
-               mlx4_cleanup_qp_table(dev);
-               mlx4_cleanup_srq_table(dev);
-               mlx4_cleanup_cq_table(dev);
-               mlx4_cmd_use_polling(dev);
-               mlx4_cleanup_eq_table(dev);
-               mlx4_cleanup_mcg_table(dev);
-               mlx4_cleanup_mr_table(dev);
-               mlx4_cleanup_xrcd_table(dev);
-               mlx4_cleanup_pd_table(dev);
+       /* in SRIOV it is not allowed to unload the pf's
+        * driver while there are alive vf's */
+       if (mlx4_is_master(dev) && mlx4_how_many_lives_vf(dev))
+               printk(KERN_ERR "Removing PF when there are assigned VF's !!!\n");
+       mlx4_stop_sense(dev);
+       mlx4_unregister_device(dev);
 
-               if (mlx4_is_master(dev))
-                       mlx4_free_resource_tracker(dev,
-                                                  RES_TR_FREE_STRUCTS_ONLY);
-
-               iounmap(priv->kar);
-               mlx4_uar_free(dev, &priv->driver_uar);
-               mlx4_cleanup_uar_table(dev);
-               if (!mlx4_is_slave(dev))
-                       mlx4_clear_steering(dev);
-               mlx4_free_eq_table(dev);
-               if (mlx4_is_master(dev))
-                       mlx4_multi_func_cleanup(dev);
-               mlx4_close_hca(dev);
-               if (mlx4_is_slave(dev))
-                       mlx4_multi_func_cleanup(dev);
-               mlx4_cmd_cleanup(dev);
-
-               if (dev->flags & MLX4_FLAG_MSI_X)
-                       pci_disable_msix(pdev);
-               if (dev->flags & MLX4_FLAG_SRIOV) {
-                       mlx4_warn(dev, "Disabling SR-IOV\n");
-                       pci_disable_sriov(pdev);
-               }
+       for (p = 1; p <= dev->caps.num_ports; p++) {
+               mlx4_cleanup_port_info(&priv->port[p]);
+               mlx4_CLOSE_PORT(dev, p);
+       }
 
-               if (!mlx4_is_slave(dev))
-                       mlx4_free_ownership(dev);
+       if (mlx4_is_master(dev))
+               mlx4_free_resource_tracker(dev,
+                                          RES_TR_FREE_SLAVES_ONLY);
+
+       mlx4_cleanup_counters_table(dev);
+       mlx4_cleanup_qp_table(dev);
+       mlx4_cleanup_srq_table(dev);
+       mlx4_cleanup_cq_table(dev);
+       mlx4_cmd_use_polling(dev);
+       mlx4_cleanup_eq_table(dev);
+       mlx4_cleanup_mcg_table(dev);
+       mlx4_cleanup_mr_table(dev);
+       mlx4_cleanup_xrcd_table(dev);
+       mlx4_cleanup_pd_table(dev);
 
-               kfree(dev->caps.qp0_tunnel);
-               kfree(dev->caps.qp0_proxy);
-               kfree(dev->caps.qp1_tunnel);
-               kfree(dev->caps.qp1_proxy);
-               kfree(dev->dev_vfs);
+       if (mlx4_is_master(dev))
+               mlx4_free_resource_tracker(dev,
+                                          RES_TR_FREE_STRUCTS_ONLY);
 
-               kfree(priv);
-               pci_release_regions(pdev);
-               pci_disable_device(pdev);
-               pci_set_drvdata(pdev, NULL);
+       iounmap(priv->kar);
+       mlx4_uar_free(dev, &priv->driver_uar);
+       mlx4_cleanup_uar_table(dev);
+       if (!mlx4_is_slave(dev))
+               mlx4_clear_steering(dev);
+       mlx4_free_eq_table(dev);
+       if (mlx4_is_master(dev))
+               mlx4_multi_func_cleanup(dev);
+       mlx4_close_hca(dev);
+       if (mlx4_is_slave(dev))
+               mlx4_multi_func_cleanup(dev);
+       mlx4_cmd_cleanup(dev);
+
+       if (dev->flags & MLX4_FLAG_MSI_X)
+               pci_disable_msix(pdev);
+       if (dev->flags & MLX4_FLAG_SRIOV) {
+               mlx4_warn(dev, "Disabling SR-IOV\n");
+               pci_disable_sriov(pdev);
        }
+
+       if (!mlx4_is_slave(dev))
+               mlx4_free_ownership(dev);
+
+       kfree(dev->caps.qp0_tunnel);
+       kfree(dev->caps.qp0_proxy);
+       kfree(dev->caps.qp1_tunnel);
+       kfree(dev->caps.qp1_proxy);
+       kfree(dev->dev_vfs);
+
+       pci_release_regions(pdev);
+       pci_disable_device(pdev);
+       memset(priv, 0, sizeof(*priv));
+       priv->pci_dev_data = pci_dev_data;
+       priv->removed = 1;
+}
+
+static void mlx4_remove_one(struct pci_dev *pdev)
+{
+       struct mlx4_dev  *dev  = pci_get_drvdata(pdev);
+       struct mlx4_priv *priv = mlx4_priv(dev);
+
+       __mlx4_remove_one(pdev);
+       kfree(priv);
+       pci_set_drvdata(pdev, NULL);
 }
 
 int mlx4_restart_one(struct pci_dev *pdev)
@@ -2692,7 +2710,7 @@ int mlx4_restart_one(struct pci_dev *pdev)
        int               pci_dev_data;
 
        pci_dev_data = priv->pci_dev_data;
-       mlx4_remove_one(pdev);
+       __mlx4_remove_one(pdev);
        return __mlx4_init_one(pdev, pci_dev_data);
 }
 
@@ -2747,7 +2765,7 @@ MODULE_DEVICE_TABLE(pci, mlx4_pci_table);
 static pci_ers_result_t mlx4_pci_err_detected(struct pci_dev *pdev,
                                              pci_channel_state_t state)
 {
-       mlx4_remove_one(pdev);
+       __mlx4_remove_one(pdev);
 
        return state == pci_channel_io_perm_failure ?
                PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_NEED_RESET;
@@ -2755,11 +2773,11 @@ static pci_ers_result_t mlx4_pci_err_detected(struct pci_dev *pdev,
 
 static pci_ers_result_t mlx4_pci_slot_reset(struct pci_dev *pdev)
 {
-       const struct pci_device_id *id;
-       int ret;
+       struct mlx4_dev  *dev  = pci_get_drvdata(pdev);
+       struct mlx4_priv *priv = mlx4_priv(dev);
+       int               ret;
 
-       id = pci_match_id(mlx4_pci_table, pdev);
-       ret = __mlx4_init_one(pdev, id->driver_data);
+       ret = __mlx4_init_one(pdev, priv->pci_dev_data);
 
        return ret ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
 }

diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
index cf8be41abb36f9e0b5324abce28d24e81f4963e8..f9c46510196341a6089b0a23d7b53455dad69ae5 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h
@@ -800,6 +800,7 @@ struct mlx4_priv {
        spinlock_t              ctx_lock;
 
        int                     pci_dev_data;
+       int                     removed;
 
        struct list_head        pgdir_list;
        struct mutex            pgdir_mutex;