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authorSteve Wise <swise@opengridcomputing.com>2008-11-12 10:16:47 -0800
committerRoland Dreier <rolandd@cisco.com>2008-11-12 10:16:47 -0800
commitb3e123cf65baadc0cc30a843fd48cfd6a4b2e1ca (patch)
treed18868ac64c78daeab54d11e3853cf544aaf506d /drivers/infiniband/hw/cxgb3/iwch_provider.c
parentaf2b0a1ec37c61513d83d2d123658b4ef69d2ce9 (diff)
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>
Diffstat (limited to 'drivers/infiniband/hw/cxgb3/iwch_provider.c')
-rw-r--r--drivers/infiniband/hw/cxgb3/iwch_provider.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index ecff9804358..160ef482712 100644
--- 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);
}