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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/core/cm.c | |
| 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/core/cm.c')
| -rw-r--r-- | drivers/infiniband/core/cm.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c index 3a972ebf3c0d..82d5c4362aa8 100644 --- a/drivers/infiniband/core/cm.c +++ b/drivers/infiniband/core/cm.c @@ -58,7 +58,7 @@ MODULE_DESCRIPTION("InfiniBand CM"); MODULE_LICENSE("Dual BSD/GPL"); static void cm_add_one(struct ib_device *device); -static void cm_remove_one(struct ib_device *device); +static void cm_remove_one(struct ib_device *device, void *client_data); static struct ib_client cm_client = { .name = "cm", @@ -3886,9 +3886,9 @@ free: kfree(cm_dev); } -static void cm_remove_one(struct ib_device *ib_device) +static void cm_remove_one(struct ib_device *ib_device, void *client_data) { - struct cm_device *cm_dev; + struct cm_device *cm_dev = client_data; struct cm_port *port; struct ib_port_modify port_modify = { .clr_port_cap_mask = IB_PORT_CM_SUP @@ -3896,7 +3896,6 @@ static void cm_remove_one(struct ib_device *ib_device) unsigned long flags; int i; - cm_dev = ib_get_client_data(ib_device, &cm_client); if (!cm_dev) return; |