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IB/core: Add locking around event dispatching on XRC target QPs

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Fix a potential race when event occurrs on a target XRC QP and in the
middle of reporting that on its shared qps, one of them is destroyed
by user space application.  Also add note for kernel consumers in
ib_verbs.h that they must not destroy the QP from within the handler.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Yishai Hadas 2013-08-01 18:49:53 +03:00 committed by Roland Dreier
parent 5c5f3f0a74
commit 73c40c616a
2 changed files with 9 additions and 0 deletions
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3
drivers/infiniband/core/verbs.c
View File

@ -346,10 +346,13 @@ EXPORT_SYMBOL(ib_destroy_srq);
static void __ib_shared_qp_event_handler(struct ib_event *event, void *context)
{
struct ib_qp *qp = context;
unsigned long flags;
spin_lock_irqsave(&qp->device->event_handler_lock, flags);
list_for_each_entry(event->element.qp, &qp->open_list, open_list)
if (event->element.qp->event_handler)
event->element.qp->event_handler(event, event->element.qp->qp_context);
spin_unlock_irqrestore(&qp->device->event_handler_lock, flags);
}
static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp)

6
include/rdma/ib_verbs.h
View File

@ -635,6 +635,12 @@ enum ib_qp_create_flags {
IB_QP_CREATE_RESERVED_END = 1 << 31,
};
/*
* Note: users may not call ib_close_qp or ib_destroy_qp from the event_handler
* callback to destroy the passed in QP.
*/
struct ib_qp_init_attr {
void (*event_handler)(struct ib_event *, void *);
void *qp_context;