67 	struct nfcsim_link *link;  in nfcsim_link_new()  local
69 	link = kzalloc(sizeof(struct nfcsim_link), GFP_KERNEL);  in nfcsim_link_new()
70 	if (!link)  in nfcsim_link_new()
73 	mutex_init(&link->lock);  in nfcsim_link_new()
74 	init_waitqueue_head(&link->recv_wait);  in nfcsim_link_new()
76 	return link;  in nfcsim_link_new()
79 static void nfcsim_link_free(struct nfcsim_link *link)  in nfcsim_link_free()  argument
81 	dev_kfree_skb(link->skb);  in nfcsim_link_free()
82 	kfree(link);  in nfcsim_link_free()
85 static void nfcsim_link_recv_wake(struct nfcsim_link *link)  in nfcsim_link_recv_wake()  argument
87 	link->cond = 1;  in nfcsim_link_recv_wake()
88 	wake_up_interruptible(&link->recv_wait);  in nfcsim_link_recv_wake()
91 static void nfcsim_link_set_skb(struct nfcsim_link *link, struct sk_buff *skb,  in nfcsim_link_set_skb()  argument
94 	mutex_lock(&link->lock);  in nfcsim_link_set_skb()
96 	dev_kfree_skb(link->skb);  in nfcsim_link_set_skb()
97 	link->skb = skb;  in nfcsim_link_set_skb()
98 	link->rf_tech = rf_tech;  in nfcsim_link_set_skb()
99 	link->mode = mode;  in nfcsim_link_set_skb()
101 	mutex_unlock(&link->lock);  in nfcsim_link_set_skb()
104 static void nfcsim_link_recv_cancel(struct nfcsim_link *link)  in nfcsim_link_recv_cancel()  argument
106 	mutex_lock(&link->lock);  in nfcsim_link_recv_cancel()
108 	link->mode = NFCSIM_MODE_NONE;  in nfcsim_link_recv_cancel()
110 	mutex_unlock(&link->lock);  in nfcsim_link_recv_cancel()
112 	nfcsim_link_recv_wake(link);  in nfcsim_link_recv_cancel()
115 static void nfcsim_link_shutdown(struct nfcsim_link *link)  in nfcsim_link_shutdown()  argument
117 	mutex_lock(&link->lock);  in nfcsim_link_shutdown()
119 	link->shutdown = 1;  in nfcsim_link_shutdown()
120 	link->mode = NFCSIM_MODE_NONE;  in nfcsim_link_shutdown()
122 	mutex_unlock(&link->lock);  in nfcsim_link_shutdown()
124 	nfcsim_link_recv_wake(link);  in nfcsim_link_shutdown()
127 static struct sk_buff *nfcsim_link_recv_skb(struct nfcsim_link *link,  in nfcsim_link_recv_skb()  argument
133 	rc = wait_event_interruptible_timeout(link->recv_wait,  in nfcsim_link_recv_skb()
134 					      link->cond,  in nfcsim_link_recv_skb()
137 	mutex_lock(&link->lock);  in nfcsim_link_recv_skb()
139 	skb = link->skb;  in nfcsim_link_recv_skb()
140 	link->skb = NULL;  in nfcsim_link_recv_skb()
147 	if (!skb || link->rf_tech != rf_tech || link->mode == mode) {  in nfcsim_link_recv_skb()
152 	if (link->shutdown) {  in nfcsim_link_recv_skb()
158 	mutex_unlock(&link->lock);  in nfcsim_link_recv_skb()
165 	link->cond = 0;  in nfcsim_link_recv_skb()