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path: root/drivers/tty/hvc/hvcs.c
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Diffstat (limited to 'drivers/tty/hvc/hvcs.c')
-rw-r--r--drivers/tty/hvc/hvcs.c74
1 files changed, 35 insertions, 39 deletions
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 3436436fe2d..d56788c8397 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -261,6 +261,7 @@ static DEFINE_SPINLOCK(hvcs_pi_lock);
/* One vty-server per hvcs_struct */
struct hvcs_struct {
+ struct tty_port port;
spinlock_t lock;
/*
@@ -269,9 +270,6 @@ struct hvcs_struct {
*/
unsigned int index;
- struct tty_struct *tty;
- int open_count;
-
/*
* Used to tell the driver kernel_thread what operations need to take
* place upon this hvcs_struct instance.
@@ -290,12 +288,11 @@ struct hvcs_struct {
int chars_in_buffer;
/*
- * Any variable below the kref is valid before a tty is connected and
+ * Any variable below is valid before a tty is connected and
* stays valid after the tty is disconnected. These shouldn't be
* whacked until the kobject refcount reaches zero though some entries
* may be changed via sysfs initiatives.
*/
- struct kref kref; /* ref count & hvcs_struct lifetime */
int connected; /* is the vty-server currently connected to a vty? */
uint32_t p_unit_address; /* partner unit address */
uint32_t p_partition_ID; /* partner partition ID */
@@ -304,9 +301,6 @@ struct hvcs_struct {
struct vio_dev *vdev;
};
-/* Required to back map a kref to its containing object */
-#define from_kref(k) container_of(k, struct hvcs_struct, kref)
-
static LIST_HEAD(hvcs_structs);
static DEFINE_SPINLOCK(hvcs_structs_lock);
static DEFINE_MUTEX(hvcs_init_mutex);
@@ -422,7 +416,7 @@ static ssize_t hvcs_vterm_state_store(struct device *dev, struct device_attribut
spin_lock_irqsave(&hvcsd->lock, flags);
- if (hvcsd->open_count > 0) {
+ if (hvcsd->port.count > 0) {
spin_unlock_irqrestore(&hvcsd->lock, flags);
printk(KERN_INFO "HVCS: vterm state unchanged. "
"The hvcs device node is still in use.\n");
@@ -564,7 +558,7 @@ static irqreturn_t hvcs_handle_interrupt(int irq, void *dev_instance)
static void hvcs_try_write(struct hvcs_struct *hvcsd)
{
uint32_t unit_address = hvcsd->vdev->unit_address;
- struct tty_struct *tty = hvcsd->tty;
+ struct tty_struct *tty = hvcsd->port.tty;
int sent;
if (hvcsd->todo_mask & HVCS_TRY_WRITE) {
@@ -602,7 +596,7 @@ static int hvcs_io(struct hvcs_struct *hvcsd)
spin_lock_irqsave(&hvcsd->lock, flags);
unit_address = hvcsd->vdev->unit_address;
- tty = hvcsd->tty;
+ tty = hvcsd->port.tty;
hvcs_try_write(hvcsd);
@@ -701,10 +695,9 @@ static void hvcs_return_index(int index)
hvcs_index_list[index] = -1;
}
-/* callback when the kref ref count reaches zero */
-static void destroy_hvcs_struct(struct kref *kref)
+static void hvcs_destruct_port(struct tty_port *p)
{
- struct hvcs_struct *hvcsd = from_kref(kref);
+ struct hvcs_struct *hvcsd = container_of(p, struct hvcs_struct, port);
struct vio_dev *vdev;
unsigned long flags;
@@ -741,6 +734,10 @@ static void destroy_hvcs_struct(struct kref *kref)
kfree(hvcsd);
}
+static const struct tty_port_operations hvcs_port_ops = {
+ .destruct = hvcs_destruct_port,
+};
+
static int hvcs_get_index(void)
{
int i;
@@ -789,10 +786,9 @@ static int __devinit hvcs_probe(
if (!hvcsd)
return -ENODEV;
-
+ tty_port_init(&hvcsd->port);
+ hvcsd->port.ops = &hvcs_port_ops;
spin_lock_init(&hvcsd->lock);
- /* Automatically incs the refcount the first time */
- kref_init(&hvcsd->kref);
hvcsd->vdev = dev;
dev_set_drvdata(&dev->dev, hvcsd);
@@ -852,7 +848,7 @@ static int __devexit hvcs_remove(struct vio_dev *dev)
spin_lock_irqsave(&hvcsd->lock, flags);
- tty = hvcsd->tty;
+ tty = hvcsd->port.tty;
spin_unlock_irqrestore(&hvcsd->lock, flags);
@@ -860,7 +856,7 @@ static int __devexit hvcs_remove(struct vio_dev *dev)
* Let the last holder of this object cause it to be removed, which
* would probably be tty_hangup below.
*/
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
/*
* The hangup is a scheduled function which will auto chain call
@@ -1094,7 +1090,7 @@ static struct hvcs_struct *hvcs_get_by_index(int index)
list_for_each_entry(hvcsd, &hvcs_structs, next) {
spin_lock_irqsave(&hvcsd->lock, flags);
if (hvcsd->index == index) {
- kref_get(&hvcsd->kref);
+ tty_port_get(&hvcsd->port);
spin_unlock_irqrestore(&hvcsd->lock, flags);
spin_unlock(&hvcs_structs_lock);
return hvcsd;
@@ -1138,8 +1134,8 @@ static int hvcs_open(struct tty_struct *tty, struct file *filp)
if ((retval = hvcs_partner_connect(hvcsd)))
goto error_release;
- hvcsd->open_count = 1;
- hvcsd->tty = tty;
+ hvcsd->port.count = 1;
+ hvcsd->port.tty = tty;
tty->driver_data = hvcsd;
memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN);
@@ -1160,7 +1156,7 @@ static int hvcs_open(struct tty_struct *tty, struct file *filp)
* and will grab the spinlock and free the connection if it fails.
*/
if (((rc = hvcs_enable_device(hvcsd, unit_address, irq, vdev)))) {
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
printk(KERN_WARNING "HVCS: enable device failed.\n");
return rc;
}
@@ -1171,8 +1167,8 @@ fast_open:
hvcsd = tty->driver_data;
spin_lock_irqsave(&hvcsd->lock, flags);
- kref_get(&hvcsd->kref);
- hvcsd->open_count++;
+ tty_port_get(&hvcsd->port);
+ hvcsd->port.count++;
hvcsd->todo_mask |= HVCS_SCHED_READ;
spin_unlock_irqrestore(&hvcsd->lock, flags);
@@ -1186,7 +1182,7 @@ open_success:
error_release:
spin_unlock_irqrestore(&hvcsd->lock, flags);
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
printk(KERN_WARNING "HVCS: partner connect failed.\n");
return retval;
@@ -1216,7 +1212,7 @@ static void hvcs_close(struct tty_struct *tty, struct file *filp)
hvcsd = tty->driver_data;
spin_lock_irqsave(&hvcsd->lock, flags);
- if (--hvcsd->open_count == 0) {
+ if (--hvcsd->port.count == 0) {
vio_disable_interrupts(hvcsd->vdev);
@@ -1225,7 +1221,7 @@ static void hvcs_close(struct tty_struct *tty, struct file *filp)
* execute any operations on the TTY even though it is obligated
* to deliver any pending I/O to the hypervisor.
*/
- hvcsd->tty = NULL;
+ hvcsd->port.tty = NULL;
irq = hvcsd->vdev->irq;
spin_unlock_irqrestore(&hvcsd->lock, flags);
@@ -1240,16 +1236,16 @@ static void hvcs_close(struct tty_struct *tty, struct file *filp)
tty->driver_data = NULL;
free_irq(irq, hvcsd);
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
return;
- } else if (hvcsd->open_count < 0) {
+ } else if (hvcsd->port.count < 0) {
printk(KERN_ERR "HVCS: vty-server@%X open_count: %d"
" is missmanaged.\n",
- hvcsd->vdev->unit_address, hvcsd->open_count);
+ hvcsd->vdev->unit_address, hvcsd->port.count);
}
spin_unlock_irqrestore(&hvcsd->lock, flags);
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
}
static void hvcs_hangup(struct tty_struct * tty)
@@ -1261,7 +1257,7 @@ static void hvcs_hangup(struct tty_struct * tty)
spin_lock_irqsave(&hvcsd->lock, flags);
/* Preserve this so that we know how many kref refs to put */
- temp_open_count = hvcsd->open_count;
+ temp_open_count = hvcsd->port.count;
/*
* Don't kref put inside the spinlock because the destruction
@@ -1273,10 +1269,10 @@ static void hvcs_hangup(struct tty_struct * tty)
hvcsd->todo_mask = 0;
/* I don't think the tty needs the hvcs_struct pointer after a hangup */
- hvcsd->tty->driver_data = NULL;
- hvcsd->tty = NULL;
+ tty->driver_data = NULL;
+ hvcsd->port.tty = NULL;
- hvcsd->open_count = 0;
+ hvcsd->port.count = 0;
/* This will drop any buffered data on the floor which is OK in a hangup
* scenario. */
@@ -1301,7 +1297,7 @@ static void hvcs_hangup(struct tty_struct * tty)
* NOTE: If this hangup was signaled from user space then the
* final put will never happen.
*/
- kref_put(&hvcsd->kref, destroy_hvcs_struct);
+ tty_port_put(&hvcsd->port);
}
}
@@ -1347,7 +1343,7 @@ static int hvcs_write(struct tty_struct *tty,
* the middle of a write operation? This is a crummy place to do this
* but we want to keep it all in the spinlock.
*/
- if (hvcsd->open_count <= 0) {
+ if (hvcsd->port.count <= 0) {
spin_unlock_irqrestore(&hvcsd->lock, flags);
return -ENODEV;
}
@@ -1421,7 +1417,7 @@ static int hvcs_write_room(struct tty_struct *tty)
{
struct hvcs_struct *hvcsd = tty->driver_data;
- if (!hvcsd || hvcsd->open_count <= 0)
+ if (!hvcsd || hvcsd->port.count <= 0)
return 0;
return HVCS_BUFF_LEN - hvcsd->chars_in_buffer;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-13 09:25:57 +0000