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authorOliver Neukum <oliver@neukum.org>2011-02-11 12:56:40 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-02-17 10:51:13 -0800
commit5b7c1178eb94f31a0199c3b361722775c54a8db3 (patch)
tree5e60fbbb251e7314be629679b73fee7b36111cfa /drivers/usb/serial
parent9a91aedca2f4ef24344b7cd8f56570e620fbe4d5 (diff)
USB: sierra: error handling in runtime PM
resumption of devices can fail. Errors must be handled. Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial')
-rw-r--r--drivers/usb/serial/sierra.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 7481ff8a49e4..2436796e117b 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -373,7 +373,10 @@ static int sierra_send_setup(struct usb_serial_port *port)
if (!do_send)
return 0;
- usb_autopm_get_interface(serial->interface);
+ retval = usb_autopm_get_interface(serial->interface);
+ if (retval < 0)
+ return retval;
+
retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
0x22, 0x21, val, interface, NULL, 0, USB_CTRL_SET_TIMEOUT);
usb_autopm_put_interface(serial->interface);
@@ -808,8 +811,12 @@ static void sierra_close(struct usb_serial_port *port)
mutex_lock(&serial->disc_mutex);
if (!serial->disconnected) {
serial->interface->needs_remote_wakeup = 0;
- usb_autopm_get_interface(serial->interface);
- sierra_send_setup(port);
+ /* odd error handling due to pm counters */
+ if (!usb_autopm_get_interface(serial->interface))
+ sierra_send_setup(port);
+ else
+ usb_autopm_get_interface_no_resume(serial->interface);
+
}
mutex_unlock(&serial->disc_mutex);
spin_lock_irq(&intfdata->susp_lock);
@@ -862,7 +869,8 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
/* get rid of everything as in close */
sierra_close(port);
/* restore balance for autopm */
- usb_autopm_put_interface(serial->interface);
+ if (!serial->disconnected)
+ usb_autopm_put_interface(serial->interface);
return err;
}
sierra_send_setup(port);