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IB/core: Use qp->usecnt to track multicast attach/detach

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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 <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Or Gerlitz
2012-04-29 17:04:22 +03:00
committed by Roland Dreier
parent d48b97b403
commit c3bccbfbb7
2 changed files with 13 additions and 3 deletions
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2
include/rdma/ib_verbs.h
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@@ -964,7 +964,7 @@ struct ib_qp {
struct ib_srq *srq;
struct ib_xrcd *xrcd; /* XRC TGT QPs only */
struct list_head xrcd_list;
atomic_t usecnt; /* count times opened */
atomic_t usecnt; /* count times opened, mcast attaches */
struct list_head open_list;
struct ib_qp *real_qp;
struct ib_uobject *uobject;