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ipoctal: get carrier driver to avoid rmmod

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Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Federico Vaga 2014-09-02 17:31:41 +02:00 • committed by Greg Kroah-Hartman
parent 36c53b3cc3
commit 82a82340ba
1 changed files with 27 additions and 3 deletions
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30
drivers/ipack/devices/ipoctal.c
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@ -55,6 +55,12 @@ struct ipoctal {
u8 __iomem *int_space; u8 __iomem *int_space;
}; };
static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
unsigned int index)
{
return container_of(chan, struct ipoctal, channel[index]);
}
static void ipoctal_reset_channel(struct ipoctal_channel *channel) static void ipoctal_reset_channel(struct ipoctal_channel *channel)
{ {
iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
@ -82,12 +88,20 @@ static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
static int ipoctal_open(struct tty_struct *tty, struct file *file) static int ipoctal_open(struct tty_struct *tty, struct file *file)
{ {
struct ipoctal_channel *channel; struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
int err;
channel = dev_get_drvdata(tty->dev);
tty->driver_data = channel; tty->driver_data = channel;
return tty_port_open(&channel->tty_port, tty, file); if (!ipack_get_carrier(ipoctal->dev))
return -EBUSY;
err = tty_port_open(&channel->tty_port, tty, file);
if (err)
ipack_put_carrier(ipoctal->dev);
return err;
} }
static void ipoctal_reset_stats(struct ipoctal_stats *stats) static void ipoctal_reset_stats(struct ipoctal_stats *stats)
@ -629,6 +643,15 @@ static void ipoctal_shutdown(struct tty_struct *tty)
clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags); clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
} }
static void ipoctal_cleanup(struct tty_struct *tty)
{
struct ipoctal_channel *channel = tty->driver_data;
struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
/* release the carrier driver */
ipack_put_carrier(ipoctal->dev);
}
static const struct tty_operations ipoctal_fops = { static const struct tty_operations ipoctal_fops = {
.ioctl = NULL, .ioctl = NULL,
.open = ipoctal_open, .open = ipoctal_open,
@ -640,6 +663,7 @@ static const struct tty_operations ipoctal_fops = {
.get_icount = ipoctal_get_icount, .get_icount = ipoctal_get_icount,
.hangup = ipoctal_hangup, .hangup = ipoctal_hangup,
.shutdown = ipoctal_shutdown, .shutdown = ipoctal_shutdown,
.cleanup = ipoctal_cleanup,
}; };
static int ipoctal_probe(struct ipack_device *dev) static int ipoctal_probe(struct ipack_device *dev)