TTY: hvcs, use tty from tty_port

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>

diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 817f94bf95a1fc4251ff664e1557c9f41de51407..d56788c83974e840f7e2aa469da2b993806fb99d 100644 (file)
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -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;