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| author |   Haggai Eran <haggaie@mellanox.com> | 2015-07-30 17:50:14 +0300 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2015-08-30 15:48:21 -0400 |
| commit | 7c1eb45a22d76bb99236e7485958f87ef7c449cf (patch) | |
| tree | 9c4d29b17d17e99f6cfa7ccc1a542d13f9bb4269 /drivers/infiniband/ulp/ipoib | |
| parent | IB/core: Add rwsem to allow reading device list or client list (diff) | |
| download | linux-dev-7c1eb45a22d76bb99236e7485958f87ef7c449cf.tar.xz linux-dev-7c1eb45a22d76bb99236e7485958f87ef7c449cf.zip | |
IB/core: lock client data with lists_rwsem
An ib_client callback that is called with the lists_rwsem locked only for
read is protected from changes to the IB client lists, but not from
ib_unregister_device() freeing its client data. This is because
ib_unregister_device() will remove the device from the device list with
lists_rwsem locked for write, but perform the rest of the cleanup,
including the call to remove() without that lock.
Mark client data that is undergoing de-registration with a new going_down
flag in the client data context. Lock the client data list with lists_rwsem
for write in addition to using the spinlock, so that functions calling the
callback would be able to lock only lists_rwsem for read and let callbacks
sleep.
Since ib_unregister_client() now marks the client data context, no need for
remove() to search the context again, so pass the client data directly to
remove() callbacks.
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/ulp/ipoib')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index b2943c84a5dd..cca1a0c91ec4 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -89,7 +89,7 @@ struct workqueue_struct *ipoib_workqueue; struct ib_sa_client ipoib_sa_client; static void ipoib_add_one(struct ib_device *device); -static void ipoib_remove_one(struct ib_device *device); +static void ipoib_remove_one(struct ib_device *device, void *client_data); static void ipoib_neigh_reclaim(struct rcu_head *rp); static struct ib_client ipoib_client = { @@ -1715,12 +1715,11 @@ static void ipoib_add_one(struct ib_device *device) ib_set_client_data(device, &ipoib_client, dev_list); } -static void ipoib_remove_one(struct ib_device *device) +static void ipoib_remove_one(struct ib_device *device, void *client_data) { struct ipoib_dev_priv *priv, *tmp; - struct list_head *dev_list; + struct list_head *dev_list = client_data; - dev_list = ib_get_client_data(device, &ipoib_client); if (!dev_list) return; |