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| author | Oliver Neukum <oliver@neukum.org> | 2011-02-11 14:56:40 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-17 21:51:13 +0300 |
| commit | 5b7c1178eb94f31a0199c3b361722775c54a8db3 (patch) | |
| tree | 5e60fbbb251e7314be629679b73fee7b36111cfa | |
| parent | 9a91aedca2f4ef24344b7cd8f56570e620fbe4d5 (diff) | |
| download | linux-5b7c1178eb94f31a0199c3b361722775c54a8db3.tar.xz | |
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>
| -rw-r--r-- | drivers/usb/serial/sierra.c | 16 |
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); |