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USB: ssu100: add locking for port private data in ssu100

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Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Bill Pemberton 2010-08-05 17:01:05 -04:00 committed by Greg Kroah-Hartman
parent 96f2a34d2c
commit 175230587b
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/serial/ssu100.c
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@ -99,6 +99,7 @@ static struct usb_driver ssu100_driver = {
};
struct ssu100_port_private {
spinlock_t status_lock;
u8 shadowLSR;
u8 shadowMSR;
wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
@ -333,6 +334,7 @@ static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
struct ssu100_port_private *priv = usb_get_serial_port_data(port);
u8 *data;
int result;
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
@ -350,11 +352,13 @@ static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
return result;
}
spin_lock_irqsave(&priv->status_lock, flags);
priv->shadowLSR = data[0] & (SERIAL_LSR_OE | SERIAL_LSR_PE |
SERIAL_LSR_FE | SERIAL_LSR_BI);
priv->shadowMSR = data[1] & (SERIAL_MSR_CTS | SERIAL_MSR_DSR |
SERIAL_MSR_RI | SERIAL_MSR_CD);
spin_unlock_irqrestore(&priv->status_lock, flags);
kfree(data);
@ -455,6 +459,7 @@ static void ssu100_set_max_packet_size(struct usb_serial_port *port)
unsigned num_endpoints;
int i;
unsigned long flags;
num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
@ -466,7 +471,9 @@ static void ssu100_set_max_packet_size(struct usb_serial_port *port)
}
/* set max packet size based on descriptor */
spin_lock_irqsave(&priv->status_lock, flags);
priv->max_packet_size = ep_desc->wMaxPacketSize;
spin_unlock_irqrestore(&priv->status_lock, flags);
dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
}
@ -485,9 +492,9 @@ static int ssu100_attach(struct usb_serial *serial)
return -ENOMEM;
}
spin_lock_init(&priv->status_lock);
init_waitqueue_head(&priv->delta_msr_wait);
usb_set_serial_port_data(port, priv);
ssu100_set_max_packet_size(port);
return ssu100_initdevice(serial->dev);