From c3bccbfbb71f5e8a77129c7a069f5c5648cc9cf1 Mon Sep 17 00:00:00 2001 From: Or Gerlitz Date: Sun, 29 Apr 2012 17:04:22 +0300 Subject: IB/core: Use qp->usecnt to track multicast attach/detach Just as we don't allow PDs, CQs, etc. to be destroyed if there are QPs that are attached to them, don't let a QP be destroyed if there are multicast group(s) attached to it. Use the existing usecnt field of struct ib_qp which was added by commit 0e0ec7e ("RDMA/core: Export ib_open_qp() to share XRC TGT QPs") to track this. Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/core/verbs.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index 575b78045aaf..c5b94d647e1e 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -1183,23 +1183,33 @@ EXPORT_SYMBOL(ib_dealloc_fmr); int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid) { + int ret; + if (!qp->device->attach_mcast) return -ENOSYS; if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD) return -EINVAL; - return qp->device->attach_mcast(qp, gid, lid); + ret = qp->device->attach_mcast(qp, gid, lid); + if (!ret) + atomic_inc(&qp->usecnt); + return ret; } EXPORT_SYMBOL(ib_attach_mcast); int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid) { + int ret; + if (!qp->device->detach_mcast) return -ENOSYS; if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD) return -EINVAL; - return qp->device->detach_mcast(qp, gid, lid); + ret = qp->device->detach_mcast(qp, gid, lid); + if (!ret) + atomic_dec(&qp->usecnt); + return ret; } EXPORT_SYMBOL(ib_detach_mcast); -- cgit v1.2.3