add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/infiniband/core/uverbs_main.c
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@@ -222,8 +222,12 @@
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 	spin_lock_irq(&ev_queue->lock);
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 	while (list_empty(&ev_queue->event_list)) {
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-		spin_unlock_irq(&ev_queue->lock);
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+		if (ev_queue->is_closed) {
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+			spin_unlock_irq(&ev_queue->lock);
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+			return -EIO;
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+		}
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+		spin_unlock_irq(&ev_queue->lock);
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 		if (filp->f_flags & O_NONBLOCK)
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 			return -EAGAIN;
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@@ -233,12 +237,6 @@
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 			return -ERESTARTSYS;
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 		spin_lock_irq(&ev_queue->lock);
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-
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-		/* If device was disassociated and no event exists set an error */
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-		if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) {
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-			spin_unlock_irq(&ev_queue->lock);
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-			return -EIO;
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-		}
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 	}
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 	event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
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@@ -537,7 +535,7 @@
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 	if (hdr->in_words * 4 != count)
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 		return -EINVAL;
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-	if (count < method_elm->req_size + sizeof(hdr)) {
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+	if (count < method_elm->req_size + sizeof(*hdr)) {
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 		/*
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 		 * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
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 		 * with a 16 byte write instead of 24. Old kernels didn't