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Subject[PATCH 41/69] TTY: hvcs, use kref from tty_port
Date
A simple switch. Except we convert destroy_hvcs_struct to be
tty_port_operations->destruct...

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: linuxppc-dev@lists.ozlabs.org
---
drivers/tty/hvc/hvcs.c | 34 ++++++++++++++++------------------
1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index a049ced..817f94b 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -290,12 +290,11 @@ 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 +303,6 @@ 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);
@@ -701,10 +697,9 @@ 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 +736,10 @@ 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;
@@ -790,9 +789,8 @@ static int __devinit hvcs_probe(
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);
@@ -860,7 +858,7 @@ 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 +1092,7 @@ 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;
@@ -1160,7 +1158,7 @@ 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;
}
@@ -1171,7 +1169,7 @@ fast_open:
hvcsd = tty->driver_data;

spin_lock_irqsave(&hvcsd->lock, flags);
- kref_get(&hvcsd->kref);
+ tty_port_get(&hvcsd->port);
hvcsd->port.count++;
hvcsd->todo_mask |= HVCS_SCHED_READ;
spin_unlock_irqrestore(&hvcsd->lock, flags);
@@ -1186,7 +1184,7 @@ 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;
@@ -1240,7 +1238,7 @@ 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->port.count < 0) {
printk(KERN_ERR "HVCS: vty-server@%X open_count: %d"
@@ -1249,7 +1247,7 @@ static void hvcs_close(struct tty_struct *tty, struct file *filp)
}

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)
@@ -1301,7 +1299,7 @@ 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);
}
}

--
1.7.9.2



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