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USB: usb-serial: replace shutdown with disconnect, release

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This patch (as1254) splits up the shutdown method of usb_serial_driver
into a disconnect and a release method.

The problem is that the usb-serial core was calling shutdown during
disconnect handling, but drivers didn't expect it to be called until
after all the open file references had been closed.  The result was an
oops when the close method tried to use memory that had been
deallocated by shutdown.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2009-06-02 11:53:55 -04:00
committed by Greg Kroah-Hartman
parent c706ebdfc8
commit f9c99bb8b3
37 changed files with 297 additions and 198 deletions
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13
drivers/usb/serial/mct_u232.c
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@@ -92,7 +92,7 @@ static int debug;
* Function prototypes
*/
static int mct_u232_startup(struct usb_serial *serial);
static void mct_u232_shutdown(struct usb_serial *serial);
static void mct_u232_release(struct usb_serial *serial);
static int mct_u232_open(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp);
static void mct_u232_close(struct usb_serial_port *port);
@@ -149,7 +149,7 @@ static struct usb_serial_driver mct_u232_device = {
.tiocmget = mct_u232_tiocmget,
.tiocmset = mct_u232_tiocmset,
.attach = mct_u232_startup,
.shutdown = mct_u232_shutdown,
.release = mct_u232_release,
};
@@ -407,7 +407,7 @@ static int mct_u232_startup(struct usb_serial *serial)
} /* mct_u232_startup */
static void mct_u232_shutdown(struct usb_serial *serial)
static void mct_u232_release(struct usb_serial *serial)
{
struct mct_u232_private *priv;
int i;
@@ -417,12 +417,9 @@ static void mct_u232_shutdown(struct usb_serial *serial)
for (i = 0; i < serial->num_ports; ++i) {
/* My special items, the standard routines free my urbs */
priv = usb_get_serial_port_data(serial->port[i]);
if (priv) {
usb_set_serial_port_data(serial->port[i], NULL);
kfree(priv);
}
kfree(priv);
}
} /* mct_u232_shutdown */
} /* mct_u232_release */
static int mct_u232_open(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp)