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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/srp | |
| 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/srp')
| -rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 31a20b462266..7755df444cfd 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -131,7 +131,7 @@ MODULE_PARM_DESC(ch_count, "Number of RDMA channels to use for communication with an SRP target. Using more than one channel improves performance if the HCA supports multiple completion vectors. The default value is the minimum of four times the number of online CPU sockets and the number of completion vectors supported by the HCA."); static void srp_add_one(struct ib_device *device); -static void srp_remove_one(struct ib_device *device); +static void srp_remove_one(struct ib_device *device, void *client_data); static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr); static void srp_send_completion(struct ib_cq *cq, void *ch_ptr); static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event); @@ -3460,13 +3460,13 @@ free_attr: kfree(dev_attr); } -static void srp_remove_one(struct ib_device *device) +static void srp_remove_one(struct ib_device *device, void *client_data) { struct srp_device *srp_dev; struct srp_host *host, *tmp_host; struct srp_target_port *target; - srp_dev = ib_get_client_data(device, &srp_client); + srp_dev = client_data; if (!srp_dev) return; |