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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 /net | |
| parent | 5aa44bb90f047662c12c44be1b6de454658632d0 (diff) | |
| download | linux-stable-7c1eb45a22d76bb99236e7485958f87ef7c449cf.tar.gz linux-stable-7c1eb45a22d76bb99236e7485958f87ef7c449cf.tar.bz2 linux-stable-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 'net')
| -rw-r--r-- | net/rds/ib.c | 5 | ||||
| -rw-r--r-- | net/rds/iw.c | 5 |
2 files changed, 4 insertions, 6 deletions
diff --git a/net/rds/ib.c b/net/rds/ib.c index ba2dffeff608..348ac37c1161 100644 --- a/net/rds/ib.c +++ b/net/rds/ib.c @@ -230,11 +230,10 @@ struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device) * * This can be called at any time and can be racing with any other RDS path. */ -static void rds_ib_remove_one(struct ib_device *device) +static void rds_ib_remove_one(struct ib_device *device, void *client_data) { - struct rds_ib_device *rds_ibdev; + struct rds_ib_device *rds_ibdev = client_data; - rds_ibdev = ib_get_client_data(device, &rds_ib_client); if (!rds_ibdev) return; diff --git a/net/rds/iw.c b/net/rds/iw.c index 589935661d66..7cc2f32a0cb3 100644 --- a/net/rds/iw.c +++ b/net/rds/iw.c @@ -125,12 +125,11 @@ free_attr: kfree(dev_attr); } -static void rds_iw_remove_one(struct ib_device *device) +static void rds_iw_remove_one(struct ib_device *device, void *client_data) { - struct rds_iw_device *rds_iwdev; + struct rds_iw_device *rds_iwdev = client_data; struct rds_iw_cm_id *i_cm_id, *next; - rds_iwdev = ib_get_client_data(device, &rds_iw_client); if (!rds_iwdev) return; |