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USB serial: update the console driver

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This patch (as1292) modifies the USB serial console driver, to make it
compatible with the recent changes to the USB serial core.  The most
important change is that serial->disc_mutex now has to be unlocked
following a successful call to usb_serial_get_by_index().

Other less notable changes include:

	Use the requested port number instead of port 0 always.

	Prevent the serial device from being autosuspended.

	Use the ASYNCB_INITIALIZED flag bit to indicate when the
	port hardware has been initialized.

In spite of these changes, there's no question that the USB serial
console code is still a big hack.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-09-04 15:29:59 -04:00 committed by Live-CD User
parent 320348c8d5
commit 7bd032dc27
1 changed files with 19 additions and 9 deletions
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28
drivers/usb/serial/console.c
View File

@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
@ -63,7 +64,7 @@ static int usb_console_setup(struct console *co, char *options)
char *s;
struct usb_serial *serial;
struct usb_serial_port *port;
int retval = 0;
int retval;
struct tty_struct *tty = NULL;
struct ktermios *termios = NULL, dummy;
@ -116,13 +117,17 @@ static int usb_console_setup(struct console *co, char *options)
return -ENODEV;
}
port = serial->port[0];
retval = usb_autopm_get_interface(serial->interface);
if (retval)
goto error_get_interface;
port = serial->port[co->index - serial->minor];
tty_port_tty_set(&port->port, NULL);
info->port = port;
++port->port.count;
if (port->port.count == 1) {
if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
if (serial->type->set_termios) {
/*
* allocate a fake tty so the driver can initialize
@ -168,6 +173,7 @@ static int usb_console_setup(struct console *co, char *options)
kfree(termios);
kfree(tty);
}
set_bit(ASYNCB_INITIALIZED, &port->port.flags);
}
/* Now that any required fake tty operations are completed restore
* the tty port count */
@ -175,18 +181,22 @@ static int usb_console_setup(struct console *co, char *options)
/* The console is special in terms of closing the device so
* indicate this port is now acting as a system console. */
port->console = 1;
retval = 0;
out:
mutex_unlock(&serial->disc_mutex);
return retval;
free_termios:
free_termios:
kfree(termios);
tty_port_tty_set(&port->port, NULL);
free_tty:
free_tty:
kfree(tty);
reset_open_count:
reset_open_count:
port->port.count = 0;
goto out;
usb_autopm_put_interface(serial->interface);
error_get_interface:
usb_serial_put(serial);
mutex_unlock(&serial->disc_mutex);
return retval;
}
static void usb_console_write(struct console *co,