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alistair23-linux
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TTY: HVC, add tty_port 

And use kref from that. This means we need tty_port->ops->destruct to
properly free the structure. This is what destroy_hvc_struct used to
do so we leverage that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Jiri Slaby 2012-04-02 13:54:21 +02:00 committed by Greg Kroah-Hartman
parent e63f9f7478
commit f3d9f25097
2 changed files with 15 additions and 10 deletions
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23
drivers/tty/hvc/hvc_console.c
View File

@ -107,7 +107,7 @@ static struct hvc_struct *hvc_get_by_index(int index)
list_for_each_entry(hp, &hvc_structs, next) {
spin_lock_irqsave(&hp->lock, flags);
if (hp->index == index) {
kref_get(&hp->kref);
tty_port_get(&hp->port);
spin_unlock_irqrestore(&hp->lock, flags);
spin_unlock(&hvc_structs_lock);
return hp;
@ -229,9 +229,9 @@ static int __init hvc_console_init(void)
console_initcall(hvc_console_init);
/* callback when the kboject ref count reaches zero. */
static void destroy_hvc_struct(struct kref *kref)
static void hvc_port_destruct(struct tty_port *port)
{
struct hvc_struct *hp = container_of(kref, struct hvc_struct, kref);
struct hvc_struct *hp = container_of(port, struct hvc_struct, port);
unsigned long flags;
spin_lock(&hvc_structs_lock);
@ -264,7 +264,7 @@ int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops)
/* make sure no no tty has been registered in this index */
hp = hvc_get_by_index(index);
if (hp) {
kref_put(&hp->kref, destroy_hvc_struct);
tty_port_put(&hp->port);
return -1;
}
@ -343,7 +343,7 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
spin_unlock_irqrestore(&hp->lock, flags);
tty_kref_put(tty);
tty->driver_data = NULL;
kref_put(&hp->kref, destroy_hvc_struct);
tty_port_put(&hp->port);
printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
}
/* Force wakeup of the polling thread */
@ -397,7 +397,7 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
}
tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
tty_port_put(&hp->port);
}
static void hvc_hangup(struct tty_struct *tty)
@ -437,7 +437,7 @@ static void hvc_hangup(struct tty_struct *tty)
while(temp_open_count) {
--temp_open_count;
tty_kref_put(tty);
kref_put(&hp->kref, destroy_hvc_struct);
tty_port_put(&hp->port);
}
}
@ -817,6 +817,10 @@ static const struct tty_operations hvc_ops = {
#endif
};
static const struct tty_port_operations hvc_port_ops = {
.destruct = hvc_port_destruct,
};
struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
const struct hv_ops *ops,
int outbuf_size)
@ -842,7 +846,8 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
hp->outbuf_size = outbuf_size;
hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
kref_init(&hp->kref);
tty_port_init(&hp->port);
hp->port.ops = &hvc_port_ops;
INIT_WORK(&hp->tty_resize, hvc_set_winsz);
spin_lock_init(&hp->lock);
@ -891,7 +896,7 @@ int hvc_remove(struct hvc_struct *hp)
* kref cause it to be removed, which will probably be the tty_vhangup
* below.
*/
kref_put(&hp->kref, destroy_hvc_struct);
tty_port_put(&hp->port);
/*
* This function call will auto chain call hvc_hangup.

2
drivers/tty/hvc/hvc_console.h
View File

@ -46,6 +46,7 @@
#define HVC_ALLOC_TTY_ADAPTERS 8
struct hvc_struct {
struct tty_port port;
spinlock_t lock;
int index;
struct tty_struct *tty;
@ -61,7 +62,6 @@ struct hvc_struct {
struct winsize ws;
struct work_struct tty_resize;
struct list_head next;
struct kref kref; /* ref count & hvc_struct lifetime */
};
/* implemented by a low level driver */