mirror of https://gitee.com/openkylin/linux.git
CAPI: Use tty_port to keep track of capiminor's tty
Use the reference management features of tty_port to look up and drop again the tty_struct associated with a capiminor. Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jan Kiszka
David S. Miller
parent
4632451180
commit
fb4b4881ef
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@ -94,7 +94,7 @@ struct capiminor {
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u16 datahandle;
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u16 msgid;
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struct tty_struct *tty;
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struct tty_port port;
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int ttyinstop;
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int ttyoutstop;
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struct sk_buff *ttyskb;
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@ -212,6 +212,8 @@ static void capiminor_del_all_ack(struct capiminor *mp)
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/* -------- struct capiminor ---------------------------------------- */
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static const struct tty_port_operations capiminor_port_ops; /* we have none */
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static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
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{
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struct capiminor *mp;
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@ -237,6 +239,9 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
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skb_queue_head_init(&mp->inqueue);
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skb_queue_head_init(&mp->outqueue);
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tty_port_init(&mp->port);
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mp->port.ops = &capiminor_port_ops;
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/* Allocate the least unused minor number. */
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write_lock_irqsave(&capiminors_lock, flags);
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for (minor = 0; minor < capi_ttyminors; minor++)
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@ -335,18 +340,22 @@ static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
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static void capincci_free_minor(struct capincci *np)
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{
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struct capiminor *mp = np->minorp;
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struct tty_struct *tty;
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if (mp) {
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capifs_free_ncci(mp->capifs_dentry);
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if (mp->tty) {
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tty = tty_port_tty_get(&mp->port);
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if (tty) {
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mp->nccip = NULL;
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#ifdef _DEBUG_REFCOUNT
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printk(KERN_DEBUG "reset mp->nccip\n");
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#endif
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tty_hangup(mp->tty);
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} else {
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capiminor_free(mp);
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tty_hangup(tty);
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tty_kref_put(tty);
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}
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capiminor_free(mp);
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}
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}
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@ -433,44 +442,48 @@ gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
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static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
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{
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struct tty_struct *tty;
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struct sk_buff *nskb;
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int datalen;
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u16 errcode, datahandle;
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struct tty_ldisc *ld;
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int ret = -1;
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datalen = skb->len - CAPIMSG_LEN(skb->data);
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if (mp->tty == NULL)
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{
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tty = tty_port_tty_get(&mp->port);
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if (!tty) {
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#ifdef _DEBUG_DATAFLOW
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printk(KERN_DEBUG "capi: currently no receiver\n");
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#endif
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return -1;
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}
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ld = tty_ldisc_ref(mp->tty);
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if (ld == NULL)
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return -1;
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ld = tty_ldisc_ref(tty);
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if (!ld)
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goto out1;
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if (ld->ops->receive_buf == NULL) {
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#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
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printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
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#endif
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goto bad;
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goto out2;
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}
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if (mp->ttyinstop) {
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#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
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printk(KERN_DEBUG "capi: recv tty throttled\n");
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#endif
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goto bad;
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goto out2;
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}
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if (mp->tty->receive_room < datalen) {
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if (tty->receive_room < datalen) {
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#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
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printk(KERN_DEBUG "capi: no room in tty\n");
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#endif
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goto bad;
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goto out2;
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}
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if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
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printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
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goto bad;
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goto out2;
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}
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datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
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errcode = capi20_put_message(mp->ap, nskb);
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@ -478,20 +491,21 @@ static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
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printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
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errcode);
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kfree_skb(nskb);
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goto bad;
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goto out2;
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}
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(void)skb_pull(skb, CAPIMSG_LEN(skb->data));
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#ifdef _DEBUG_DATAFLOW
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printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
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datahandle, skb->len);
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#endif
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ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
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ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
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kfree_skb(skb);
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ret = 0;
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out2:
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tty_ldisc_deref(ld);
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return 0;
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bad:
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tty_ldisc_deref(ld);
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return -1;
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out1:
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tty_kref_put(tty);
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return ret;
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}
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static void handle_minor_recv(struct capiminor *mp)
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@ -510,16 +524,22 @@ static void handle_minor_recv(struct capiminor *mp)
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static int handle_minor_send(struct capiminor *mp)
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{
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struct tty_struct *tty;
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struct sk_buff *skb;
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u16 len;
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int count = 0;
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u16 errcode;
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u16 datahandle;
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if (mp->tty && mp->ttyoutstop) {
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tty = tty_port_tty_get(&mp->port);
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if (!tty)
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return 0;
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if (mp->ttyoutstop) {
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#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
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printk(KERN_DEBUG "capi: send: tty stopped\n");
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#endif
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tty_kref_put(tty);
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return 0;
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}
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@ -542,6 +562,7 @@ static int handle_minor_send(struct capiminor *mp)
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if (capiminor_add_ack(mp, datahandle) < 0) {
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skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
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skb_queue_head(&mp->outqueue, skb);
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tty_kref_put(tty);
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return count;
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}
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errcode = capi20_put_message(mp->ap, skb);
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@ -568,6 +589,7 @@ static int handle_minor_send(struct capiminor *mp)
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mp->outbytes -= len;
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kfree_skb(skb);
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}
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tty_kref_put(tty);
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return count;
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}
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@ -578,6 +600,7 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
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{
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struct capidev *cdev = ap->private;
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#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
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struct tty_struct *tty;
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struct capiminor *mp;
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u16 datahandle;
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#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
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@ -641,8 +664,11 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
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#endif
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kfree_skb(skb);
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(void)capiminor_del_ack(mp, datahandle);
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if (mp->tty)
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tty_wakeup(mp->tty);
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tty = tty_port_tty_get(&mp->port);
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if (tty) {
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tty_wakeup(tty);
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tty_kref_put(tty);
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}
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(void)handle_minor_send(mp);
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} else {
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@ -1029,14 +1055,17 @@ static void capinc_tty_cleanup(struct tty_struct *tty)
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capiminor_put(mp);
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}
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static int capinc_tty_open(struct tty_struct * tty, struct file * file)
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static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
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{
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struct capiminor *mp = tty->driver_data;
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unsigned long flags;
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int err;
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err = tty_port_open(&mp->port, tty, filp);
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if (err)
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return err;
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spin_lock_irqsave(&workaround_lock, flags);
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if (atomic_read(&mp->ttyopencount) == 0)
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mp->tty = tty;
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atomic_inc(&mp->ttyopencount);
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#ifdef _DEBUG_REFCOUNT
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printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
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@ -1046,7 +1075,7 @@ static int capinc_tty_open(struct tty_struct * tty, struct file * file)
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return 0;
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}
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static void capinc_tty_close(struct tty_struct * tty, struct file * file)
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static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
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{
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struct capiminor *mp = tty->driver_data;
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@ -1054,17 +1083,15 @@ static void capinc_tty_close(struct tty_struct * tty, struct file * file)
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#ifdef _DEBUG_REFCOUNT
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printk(KERN_DEBUG "capinc_tty_close lastclose\n");
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#endif
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mp->tty = NULL;
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}
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#ifdef _DEBUG_REFCOUNT
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printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
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#endif
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if (mp->nccip == NULL)
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capiminor_free(mp);
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#ifdef _DEBUG_REFCOUNT
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printk(KERN_DEBUG "capinc_tty_close\n");
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#endif
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tty_port_close(&mp->port, tty, filp);
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}
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static int capinc_tty_write(struct tty_struct * tty,
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@ -1292,9 +1319,12 @@ static void capinc_tty_start(struct tty_struct *tty)
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static void capinc_tty_hangup(struct tty_struct *tty)
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{
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struct capiminor *mp = tty->driver_data;
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#ifdef _DEBUG_TTYFUNCS
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printk(KERN_DEBUG "capinc_tty_hangup\n");
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#endif
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tty_port_hangup(&mp->port);
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}
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static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
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