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TTY: synclink, add tty install 

This has two outcomes:
* we give the TTY layer a tty_port
* we do not find the info structure every time open is called on that
  tty

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2012-08-07 21:48:00 +02:00 committed by Greg Kroah-Hartman
parent f7e0405e74
commit 8a3ad10475
1 changed files with 26 additions and 18 deletions
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44
drivers/tty/synclink.c
View File

@ -3362,6 +3362,29 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
} /* end of block_til_ready() */
static int mgsl_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct mgsl_struct *info;
int line = tty->index;
/* verify range of specified line number */
if (line >= mgsl_device_count) {
printk("%s(%d):mgsl_open with invalid line #%d.\n",
__FILE__, __LINE__, line);
return -ENODEV;
}
/* find the info structure for the specified line */
info = mgsl_device_list;
while (info && info->line != line)
info = info->next_device;
if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
return -ENODEV;
tty->driver_data = info;
return tty_port_install(&info->port, driver, tty);
}
/* mgsl_open()
*
* Called when a port is opened. Init and enable port.
@ -3374,26 +3397,10 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
*/
static int mgsl_open(struct tty_struct *tty, struct file * filp)
{
struct mgsl_struct *info;
int retval, line;
struct mgsl_struct *info = tty->driver_data;
unsigned long flags;
int retval;
/* verify range of specified line number */
line = tty->index;
if (line >= mgsl_device_count) {
printk("%s(%d):mgsl_open with invalid line #%d.\n",
__FILE__,__LINE__,line);
return -ENODEV;
}
/* find the info structure for the specified line */
info = mgsl_device_list;
while(info && info->line != line)
info = info->next_device;
if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
return -ENODEV;
tty->driver_data = info;
info->port.tty = tty;
if (debug_level >= DEBUG_LEVEL_INFO)
@ -4297,6 +4304,7 @@ static struct mgsl_struct* mgsl_allocate_device(void)
} /* end of mgsl_allocate_device()*/
static const struct tty_operations mgsl_ops = {
.install = mgsl_install,
.open = mgsl_open,
.close = mgsl_close,
.write = mgsl_write,