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-rw-r--r--drivers/infiniband/core/ucma.c37
1 files changed, 18 insertions, 19 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 5034a87..5861cdb 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -449,24 +449,6 @@ static void ucma_cleanup_multicast(struct ucma_context *ctx)
mutex_unlock(&mut);
}
-static void ucma_cleanup_events(struct ucma_context *ctx)
-{
- struct ucma_event *uevent, *tmp;
-
- list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
- if (uevent->ctx != ctx)
- continue;
-
- list_del(&uevent->list);
-
- /* clear incoming connections. */
- if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
- rdma_destroy_id(uevent->cm_id);
-
- kfree(uevent);
- }
-}
-
static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
{
struct ucma_event *uevent, *tmp;
@@ -480,9 +462,16 @@ static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
}
}
+/*
+ * We cannot hold file->mut when calling rdma_destroy_id() or we can
+ * deadlock. We also acquire file->mut in ucma_event_handler(), and
+ * rdma_destroy_id() will wait until all callbacks have completed.
+ */
static int ucma_free_ctx(struct ucma_context *ctx)
{
int events_reported;
+ struct ucma_event *uevent, *tmp;
+ LIST_HEAD(list);
/* No new events will be generated after destroying the id. */
rdma_destroy_id(ctx->cm_id);
@@ -491,10 +480,20 @@ static int ucma_free_ctx(struct ucma_context *ctx)
/* Cleanup events not yet reported to the user. */
mutex_lock(&ctx->file->mut);
- ucma_cleanup_events(ctx);
+ list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
+ if (uevent->ctx == ctx)
+ list_move_tail(&uevent->list, &list);
+ }
list_del(&ctx->list);
mutex_unlock(&ctx->file->mut);
+ list_for_each_entry_safe(uevent, tmp, &list, list) {
+ list_del(&uevent->list);
+ if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
+ rdma_destroy_id(uevent->cm_id);
+ kfree(uevent);
+ }
+
events_reported = ctx->events_reported;
kfree(ctx);
return events_reported;