luck/tmp_suning_uos_patched
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moxa: switch to ->[sg]et_serial()

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Pointless dead assignments in moxa_set_serial_info() killed off;
they would've been a bug, if not for the fact that user-settable
flags had never been used in that driver.  Bogus from day 1,
though...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-09-11 22:01:00 -04:00
parent b60f38c664
commit 1c729ab15a
1 changed files with 40 additions and 39 deletions
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79
drivers/tty/moxa.c
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@ -221,8 +221,8 @@ static int MoxaPortRxQueue(struct moxa_port *);
static int MoxaPortTxFree(struct moxa_port *);
static void MoxaPortTxDisable(struct moxa_port *);
static void MoxaPortTxEnable(struct moxa_port *);
static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
static int moxa_get_serial_info(struct tty_struct *, struct serial_struct *);
static int moxa_set_serial_info(struct tty_struct *, struct serial_struct *);
static void MoxaSetFifo(struct moxa_port *port, int enable);
/*
@ -375,16 +375,6 @@ static int moxa_ioctl(struct tty_struct *tty,
}
break;
}
case TIOCGSERIAL:
mutex_lock(&ch->port.mutex);
ret = moxa_get_serial_info(ch, argp);
mutex_unlock(&ch->port.mutex);
break;
case TIOCSSERIAL:
mutex_lock(&ch->port.mutex);
ret = moxa_set_serial_info(ch, argp);
mutex_unlock(&ch->port.mutex);
break;
default:
ret = -ENOIOCTLCMD;
}
@ -415,6 +405,8 @@ static const struct tty_operations moxa_ops = {
.break_ctl = moxa_break_ctl,
.tiocmget = moxa_tiocmget,
.tiocmset = moxa_tiocmset,
.set_serial = moxa_set_serial_info,
.get_serial = moxa_get_serial_info,
};
static const struct tty_port_operations moxa_port_ops = {
@ -2034,46 +2026,55 @@ static void MoxaPortTxEnable(struct moxa_port *port)
moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
}
static int moxa_get_serial_info(struct moxa_port *info,
struct serial_struct __user *retinfo)
static int moxa_get_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct serial_struct tmp = {
.type = info->type,
.line = info->port.tty->index,
.flags = info->port.flags,
.baud_base = 921600,
.close_delay = info->port.close_delay
};
return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
struct moxa_port *info = tty->driver_data;
if (tty->index == MAX_PORTS)
return -EINVAL;
if (!info)
return -ENODEV;
mutex_lock(&info->port.mutex);
ss->type = info->type,
ss->line = info->port.tty->index,
ss->flags = info->port.flags,
ss->baud_base = 921600,
ss->close_delay = info->port.close_delay;
mutex_unlock(&info->port.mutex);
return 0;
}
static int moxa_set_serial_info(struct moxa_port *info,
struct serial_struct __user *new_info)
static int moxa_set_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct serial_struct new_serial;
struct moxa_port *info = tty->driver_data;
if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
return -EFAULT;
if (tty->index == MAX_PORTS)
return -EINVAL;
if (!info)
return -ENODEV;
if (new_serial.irq != 0 || new_serial.port != 0 ||
new_serial.custom_divisor != 0 ||
new_serial.baud_base != 921600)
if (ss->irq != 0 || ss->port != 0 ||
ss->custom_divisor != 0 ||
ss->baud_base != 921600)
return -EPERM;
mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if (((new_serial.flags & ~ASYNC_USR_MASK) !=
(info->port.flags & ~ASYNC_USR_MASK)))
if (((ss->flags & ~ASYNC_USR_MASK) !=
(info->port.flags & ~ASYNC_USR_MASK))) {
mutex_unlock(&info->port.mutex);
return -EPERM;
} else
info->port.close_delay = new_serial.close_delay * HZ / 100;
}
}
info->port.close_delay = ss->close_delay * HZ / 100;
new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
MoxaSetFifo(info, ss->type == PORT_16550A);
MoxaSetFifo(info, new_serial.type == PORT_16550A);
info->type = new_serial.type;
info->type = ss->type;
mutex_unlock(&info->port.mutex);
return 0;
}