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| author |   Zach Brown <zach.brown@oracle.com> | 2006-07-04 02:57:52 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-04 10:24:57 -0700 |
| commit | a46f9484f8926aacb2e79a0e1676de3a6a6fbae8 (patch) | |
| tree | 21d90306af4677091547465c1ba02e0545276d1a /drivers/infiniband/hw/mthca/mthca_qp.c | |
| parent | [PATCH] Fix copying of pgdat array on each node for ia64 memory hotplug (diff) | |
| download | linux-dev-a46f9484f8926aacb2e79a0e1676de3a6a6fbae8.tar.xz linux-dev-a46f9484f8926aacb2e79a0e1676de3a6a6fbae8.zip | |
[PATCH] mthca: initialize send and receive queue locks separately
mthca: initialize send and receive queue locks separately
lockdep identifies a lock by the call site of its initialization. By
initializing the send and receive queue locks in mthca_wq_init() we confuse
lockdep. It warns that that the ordered acquiry of both locks in
mthca_modify_qp() is recursive acquiry of one lock:
=============================================
[ INFO: possible recursive locking detected ]
---------------------------------------------
modprobe/1192 is trying to acquire lock:
(&wq->lock){....}, at: [<f892b4db>] mthca_modify_qp+0x60/0xa7b [ib_mthca]
but task is already holding lock:
(&wq->lock){....}, at: [<f892b4ce>] mthca_modify_qp+0x53/0xa7b [ib_mthca]
Initializing the locks separately in mthca_alloc_qp_common() stops the
warning and will let lockdep enforce proper ordering on paths that acquire
both locks.
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/infiniband/hw/mthca/mthca_qp.c')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_qp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c index 16c387d8170c..490fc783bb0c 100644 --- a/drivers/infiniband/hw/mthca/mthca_qp.c +++ b/drivers/infiniband/hw/mthca/mthca_qp.c @@ -224,7 +224,7 @@ static void *get_send_wqe(struct mthca_qp *qp, int n) static void mthca_wq_init(struct mthca_wq *wq) { - spin_lock_init(&wq->lock); + /* mthca_alloc_qp_common() initializes the locks */ wq->next_ind = 0; wq->last_comp = wq->max - 1; wq->head = 0; @@ -1114,6 +1114,9 @@ static int mthca_alloc_qp_common(struct mthca_dev *dev, qp->sq_policy = send_policy; mthca_wq_init(&qp->sq); mthca_wq_init(&qp->rq); + /* these are initialized separately so lockdep can tell them apart */ + spin_lock_init(&qp->sq.lock); + spin_lock_init(&qp->rq.lock); ret = mthca_map_memfree(dev, qp); if (ret) |