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author | Anish Bhatt <anish@chelsio.com> | 2014-09-16 00:44:18 (GMT) |
---|---|---|
committer | Christoph Hellwig <hch@lst.de> | 2014-09-22 14:46:13 (GMT) |
commit | 576b586303f76be9e5e2f5266ccbeba1b46bbd06 (patch) | |
tree | 68263bc156d67ba02b00cba60bc91ff0aacd2a8b /drivers/scsi/cxgbi/libcxgbi.c | |
parent | 6c1e7b7729b19eb41d93a411c82126a5993a8e90 (diff) | |
download | linux-576b586303f76be9e5e2f5266ccbeba1b46bbd06.tar.xz |
cxgb4i: avoid holding mutex in interrupt context
cxgbi_inet6addr_handler() can be called in interrupt context, so use rcu
protected list while finding netdev
Applies on top of core-for-3.18
Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: Karen Xie <kxie@chelsio.com>
Fixes: fc8d0590d914 ("libcxgbi: Add ipv6 api to driver")
Fixes: 759a0cc5a3e1 ("cxgb4i: Add ipv6 code to driver, call into libcxgbi ipv6
api")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/cxgbi/libcxgbi.c')
-rw-r--r-- | drivers/scsi/cxgbi/libcxgbi.c | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c index 4cc9787..6a2001d 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) { |