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Commit ca6a09f2 authored by Sjur Braendeland's avatar Sjur Braendeland Committed by David S. Miller
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caif: Bugfix - Poll can't return POLLHUP while connecting. 



Discovered bug when testing async connect.
While connecting poll should not return POLLHUP,
but POLLOUT when connected.
Also fixed the sysfs flow-control-counters.

Signed-off-by: default avatarSjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 638e628a

net/caif/caif_socket.c

+6 −15
Original line number Diff line number Diff line
@@ -138,7 +138,7 @@ void caif_flow_ctrl(struct sock *sk, int mode) 
{

	struct caifsock *cf_sk;

	cf_sk = container_of(sk, struct caifsock, sk);

	if (cf_sk->layer.dn)

	if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)

		cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);

}
@@ -162,9 +162,8 @@ int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 
			atomic_read(&cf_sk->sk.sk_rmem_alloc),

			sk_rcvbuf_lowwater(cf_sk));

		set_rx_flow_off(cf_sk);

		if (cf_sk->layer.dn)

			cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,

						CAIF_MODEMCMD_FLOW_OFF_REQ);

		dbfs_atomic_inc(&cnt.num_rx_flow_off);

		caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);

	}



	err = sk_filter(sk, skb);
@@ -175,9 +174,8 @@ int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 
		trace_printk("CAIF: %s():"

			" sending flow OFF due to rmem_schedule\n",

			__func__);

		if (cf_sk->layer.dn)

			cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,

						CAIF_MODEMCMD_FLOW_OFF_REQ);

		dbfs_atomic_inc(&cnt.num_rx_flow_off);

		caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);

	}

	skb->dev = NULL;

	skb_set_owner_r(skb, sk);
@@ -285,16 +283,13 @@ static void caif_check_flow_release(struct sock *sk) 
{

	struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);



	if (cf_sk->layer.dn == NULL || cf_sk->layer.dn->modemcmd == NULL)

		return;

	if (rx_flow_is_on(cf_sk))

		return;



	if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {

			dbfs_atomic_inc(&cnt.num_rx_flow_on);

			set_rx_flow_on(cf_sk);

			cf_sk->layer.dn->modemcmd(cf_sk->layer.dn,

						CAIF_MODEMCMD_FLOW_ON_REQ);

			caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);

	}

}

/*
@@ -1018,10 +1013,6 @@ static unsigned int caif_poll(struct file *file, 
		(sk->sk_shutdown & RCV_SHUTDOWN))

		mask |= POLLIN | POLLRDNORM;



	/* Connection-based need to check for termination and startup */

	if (sk->sk_state == CAIF_DISCONNECTED)

		mask |= POLLHUP;



	/*

	 * we set writable also when the other side has shut down the

	 * connection. This prevents stuck sockets.