[SCSI] cxgb4i: avoid holding mutex in interrupt context

cxgbi_inet6addr_handler() can be called in interrupt context, so use rcu
protected list while finding netdev.  This is observed as a scheduling in
atomic oops when running over ipv6.

Fixes: fc8d0590d914 ("libcxgbi: Add ipv6 api to driver")
Fixes: 759a0cc5a3e1 ("cxgb4i: Add ipv6 code to driver, call into libcxgbi ipv6 api")

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: Karen Xie <kxie@chelsio.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 55 insertions, 7 deletions

diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
index 79788a12712d..02e69e7ee4a3 100644
--- a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
+++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
@@ -1647,7 +1647,7 @@ static int cxgbi_inet6addr_handler(struct notifier_block *this,
         if (event_dev->priv_flags & IFF_802_1Q_VLAN)
                 event_dev = vlan_dev_real_dev(event_dev);
 
-        cdev = cxgbi_device_find_by_netdev(event_dev, NULL);
+        cdev = cxgbi_device_find_by_netdev_rcu(event_dev, NULL);
 
         if (!cdev)
                 return ret;
diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index d65df6dc106f..addd1dddce14 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -57,6 +57,9 @@ MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
 static LIST_HEAD(cdev_list);
 static DEFINE_MUTEX(cdev_mutex);
 
+static LIST_HEAD(cdev_rcu_list);
+static DEFINE_SPINLOCK(cdev_rcu_lock);
+
 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
                                 unsigned int max_conn)
 {
@@ -142,6 +145,10 @@ struct cxgbi_device *cxgbi_device_register(unsigned int extra,
         list_add_tail(&cdev->list_head, &cdev_list);
         mutex_unlock(&cdev_mutex);
 
+        spin_lock(&cdev_rcu_lock);
+        list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
+        spin_unlock(&cdev_rcu_lock);
+
         log_debug(1 << CXGBI_DBG_DEV,
                 "cdev 0x%p, p# %u.\n", cdev, nports);
         return cdev;
@@ -153,9 +160,16 @@ void cxgbi_device_unregister(struct cxgbi_device *cdev)
         log_debug(1 << CXGBI_DBG_DEV,
                 "cdev 0x%p, p# %u,%s.\n",
                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
+
         mutex_lock(&cdev_mutex);
         list_del(&cdev->list_head);
         mutex_unlock(&cdev_mutex);
+
+        spin_lock(&cdev_rcu_lock);
+        list_del_rcu(&cdev->rcu_node);
+        spin_unlock(&cdev_rcu_lock);
+        synchronize_rcu();
+
         cxgbi_device_destroy(cdev);
 }
 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
@@ -167,12 +181,9 @@ void cxgbi_device_unregister_all(unsigned int flag)
         mutex_lock(&cdev_mutex);
         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
                 if ((cdev->flags & flag) == flag) {
-                        log_debug(1 << CXGBI_DBG_DEV,
-                                "cdev 0x%p, p# %u,%s.\n",
-                                cdev, cdev->nports, cdev->nports ?
-                                 cdev->ports[0]->name : "");
-                        list_del(&cdev->list_head);
-                        cxgbi_device_destroy(cdev);
+                        mutex_unlock(&cdev_mutex);
+                        cxgbi_device_unregister(cdev);
+                        mutex_lock(&cdev_mutex);
                 }
         }
         mutex_unlock(&cdev_mutex);
@@ -191,6 +202,7 @@ struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
                 }
         }
         mutex_unlock(&cdev_mutex);
+
         log_debug(1 << CXGBI_DBG_DEV,
                 "lldev 0x%p, NO match found.\n", lldev);
         return NULL;
@@ -230,6 +242,39 @@ struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 }
 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 
+struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
+                                                     int *port)
+{
+        struct net_device *vdev = NULL;
+        struct cxgbi_device *cdev;
+        int i;
+
+        if (ndev->priv_flags & IFF_802_1Q_VLAN) {
+                vdev = ndev;
+                ndev = vlan_dev_real_dev(ndev);
+                pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
+        }
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
+                for (i = 0; i < cdev->nports; i++) {
+                        if (ndev == cdev->ports[i]) {
+                                cdev->hbas[i]->vdev = vdev;
+                                rcu_read_unlock();
+                                if (port)
+                                        *port = i;
+                                return cdev;
+                        }
+                }
+        }
+        rcu_read_unlock();
+
+        log_debug(1 << CXGBI_DBG_DEV,
+                  "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
+
 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
                                                      int *port)
 {
diff --git a/drivers/scsi/cxgbi/libcxgbi.h b/drivers/scsi/cxgbi/libcxgbi.h
index b3e6e7541cc5..1d98fad6a0ab 100644
--- a/drivers/scsi/cxgbi/libcxgbi.h
+++ b/drivers/scsi/cxgbi/libcxgbi.h
@@ -527,6 +527,7 @@ struct cxgbi_ports_map {
 #define CXGBI_FLAG_IPV4_SET             0x10
 struct cxgbi_device {
         struct list_head list_head;
+        struct list_head rcu_node;
         unsigned int flags;
         struct net_device **ports;
         void *lldev;
@@ -709,6 +710,8 @@ void cxgbi_device_unregister(struct cxgbi_device *);
 void cxgbi_device_unregister_all(unsigned int flag);
 struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *, int *);
+struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *,
+                                                     int *);
 int cxgbi_hbas_add(struct cxgbi_device *, u64, unsigned int,
                         struct scsi_host_template *,
                         struct scsi_transport_template *);