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TTY: hvcs, use tty from tty_port

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No refcounting, just a switch. The locking in the driver prevents
races, so in fact the refcounting is not needed. But while we have a
tty in tty_port, don't duplicate that and remove the one from
hvcs_struct.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-04-02 13:54:26 +02:00 committed by Greg Kroah-Hartman
parent 2cd9fa2545
commit 6968a7592a
1 changed files with 7 additions and 9 deletions
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16
drivers/tty/hvc/hvcs.c
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@ -270,8 +270,6 @@ struct hvcs_struct {
*/
unsigned int index;
struct tty_struct *tty;
/*
* Used to tell the driver kernel_thread what operations need to take
* place upon this hvcs_struct instance.
@ -560,7 +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) {
@ -598,7 +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);
@ -850,7 +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);
@ -1137,7 +1135,7 @@ static int hvcs_open(struct tty_struct *tty, struct file *filp)
goto error_release;
hvcsd->port.count = 1;
hvcsd->tty = tty;
hvcsd->port.tty = tty;
tty->driver_data = hvcsd;
memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN);
@ -1223,7 +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);
@ -1271,8 +1269,8 @@ 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->port.count = 0;