USB serial: update the console driver
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>
diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index be086e4..b22ac32 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -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 @@
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 @@
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 @@
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 @@
/* 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,