RDMA/cxgb3: Fix deadlock in iw_cxgb3 (hang when configuring interface)

When the iw_cxgb3 module's cxgb3_client "add" func gets called by the
cxgb3 module, the iwarp driver ends up calling the ethtool ops
get_drvinfo function in cxgb3 to get the fw version and other info.
Currently the iwarp driver grabs the rtnl lock around this down call
to serialize.  As of 2.6.27 or so, things changed such that the rtnl
lock is held around the call to the netdev driver open function.  Also
the cxgb3_client "add" function doesn't get called if the device is
down.

So, if you load cxgb3, then load iw_cxgb3, then ifconfig up the
device, the iw_cxgb3 add func gets called with the rtnl_lock held.  If
you load cxgb3, ifconfig up the device, then load iw_cxgb3, the add
func gets called without the rtnl_lock held.  The former causes the
deadlock, the latter does not.

In addition, there are iw_cxgb3 sysfs handlers that also can call down
into cxgb3 to gather the fw and hw versions.  These can be called
concurrently on different processors and at any time.  Thus we need to
push this serialization down in the cxgb3 driver get_drvinfo func.

The fix is to remove rtnl lock usage, and use a per-device lock in cxgb3.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Acked-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index ecff98043589c5e15646d28f028e81858d3a6562..160ef482712dea2a3b33a080d5cc721dbbb014dc 100644 (file)
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -1102,9 +1102,7 @@ static u64 fw_vers_string_to_u64(struct iwch_dev *iwch_dev)
        char *cp, *next;
        unsigned fw_maj, fw_min, fw_mic;
 
-       rtnl_lock();
        lldev->ethtool_ops->get_drvinfo(lldev, &info);
-       rtnl_unlock();
 
        next = info.fw_version + 1;
        cp = strsep(&next, ".");
@@ -1192,9 +1190,7 @@ static ssize_t show_fw_ver(struct device *dev, struct device_attribute *attr, ch
        struct net_device *lldev = iwch_dev->rdev.t3cdev_p->lldev;
 
        PDBG("%s dev 0x%p\n", __func__, dev);
-       rtnl_lock();
        lldev->ethtool_ops->get_drvinfo(lldev, &info);
-       rtnl_unlock();
        return sprintf(buf, "%s\n", info.fw_version);
 }
 
@@ -1207,9 +1203,7 @@ static ssize_t show_hca(struct device *dev, struct device_attribute *attr,
        struct net_device *lldev = iwch_dev->rdev.t3cdev_p->lldev;
 
        PDBG("%s dev 0x%p\n", __func__, dev);
-       rtnl_lock();
        lldev->ethtool_ops->get_drvinfo(lldev, &info);
-       rtnl_unlock();
        return sprintf(buf, "%s\n", info.driver);
 }
 

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 1ace41a13ac360363b2857475920a014daad4e94..5e663ccda4d4473f675cdf887ab507131b1bfb90 100644 (file)
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -1307,8 +1307,10 @@ static void get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
        u32 fw_vers = 0;
        u32 tp_vers = 0;
 
+       spin_lock(&adapter->stats_lock);
        t3_get_fw_version(adapter, &fw_vers);
        t3_get_tp_version(adapter, &tp_vers);
+       spin_unlock(&adapter->stats_lock);
 
        strcpy(info->driver, DRV_NAME);
        strcpy(info->version, DRV_VERSION);