I sometimes get this erroneous warning message about lock recursion :
: [ INFO: possible recursive locking detected ]
: rdma_bw/3558 is trying to acquire lock:
: (&cq->lock){....}, at: [<f9398d36>] c2_free_qp+0x78/0x180 [iw_c2]
: but task is already holding lock:
: (&cq->lock){....}, at: [<f9398d29>] c2_free_qp+0x6b/0x180 [iw_c2]
The fix is to teach lockdep about this nesting of a lock-class.
Patch against 2.6.19-rc5.
Signed-off-by: Krishna Kumar <[EMAIL PROTECTED]>
---
diff -ruNp org/drivers/infiniband/hw/amso1100/c2_qp.c
new/drivers/infiniband/hw/amso1100/c2_qp.c
--- org/drivers/infiniband/hw/amso1100/c2_qp.c 2006-11-15 12:40:04.000000000
+0530
+++ new/drivers/infiniband/hw/amso1100/c2_qp.c 2006-11-15 13:02:03.000000000
+0530
@@ -578,7 +578,7 @@ void c2_free_qp(struct c2_dev *c2dev, st
*/
spin_lock_irq(&send_cq->lock);
if (send_cq != recv_cq)
- spin_lock(&recv_cq->lock);
+ spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
c2_free_qpn(c2dev, qp->qpn);
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