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sdio_uart: Move the open lock 

When we move to the tty_port logic the port mutex will protect open v close
v hangup. Move to this first in the existing open code so we have a bisection
point.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-11-05 13:28:38 +00:00 committed by Greg Kroah-Hartman
parent 530646f469
commit 0a68f64feb
1 changed files with 9 additions and 11 deletions
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20
drivers/mmc/card/sdio_uart.c
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@ -78,7 +78,6 @@ struct sdio_uart_port {
struct tty_struct *tty;
unsigned int index;
unsigned int opened;
struct mutex open_lock;
struct sdio_func *func;
struct mutex func_lock;
struct task_struct *in_sdio_uart_irq;
@ -103,7 +102,6 @@ static int sdio_uart_add_port(struct sdio_uart_port *port)
int index, ret = -EBUSY;
kref_init(&port->kref);
mutex_init(&port->open_lock);
mutex_init(&port->func_lock);
spin_lock_init(&port->write_lock);
@ -166,7 +164,7 @@ static void sdio_uart_port_remove(struct sdio_uart_port *port)
* give up on that port ASAP.
* Beware: the lock ordering is critical.
*/
mutex_lock(&port->open_lock);
mutex_lock(&port->port.mutex);
mutex_lock(&port->func_lock);
func = port->func;
sdio_claim_host(func);
@ -179,7 +177,7 @@ static void sdio_uart_port_remove(struct sdio_uart_port *port)
tty_hangup(tty);
tty_kref_put(tty);
}
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
sdio_release_irq(func);
sdio_disable_func(func);
sdio_release_host(func);
@ -699,14 +697,14 @@ static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
if (!port)
return -ENODEV;
mutex_lock(&port->open_lock);
mutex_lock(&port->port.mutex);
/*
* Make sure not to mess up with a dead port
* which has not been closed yet.
*/
if (tty->driver_data && tty->driver_data != port) {
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
sdio_uart_port_put(port);
return -EBUSY;
}
@ -718,13 +716,13 @@ static int sdio_uart_open(struct tty_struct *tty, struct file *filp)
if (ret) {
tty->driver_data = NULL;
tty_port_tty_set(&port->port, NULL);
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
sdio_uart_port_put(port);
return ret;
}
}
port->opened++;
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
return 0;
}
@ -735,7 +733,7 @@ static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
if (!port)
return;
mutex_lock(&port->open_lock);
mutex_lock(&port->port.mutex);
BUG_ON(!port->opened);
/*
@ -744,7 +742,7 @@ static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
* is larger than port->count.
*/
if (tty->count > port->opened) {
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
return;
}
@ -756,7 +754,7 @@ static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
tty->driver_data = NULL;
tty->closing = 0;
}
mutex_unlock(&port->open_lock);
mutex_unlock(&port->port.mutex);
sdio_uart_port_put(port);
}