USB: autosuspend for cdc-acm

Here we go. This patch implements suspend/resume and autosuspend
for the CDC ACM driver.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h
index 09f7765dbf8d..8df6a57dcf9e 100644
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -107,6 +107,7 @@ struct acm {
         int write_used;                                 /* number of non-empty write buffers */
         int write_ready;                                /* write urb is not running */
         spinlock_t write_lock;
+        struct mutex mutex;
         struct usb_cdc_line_coding line;                /* bits, stop, parity */
         struct work_struct work;                        /* work queue entry for line discipline waking up */
         struct tasklet_struct urb_task;                 /* rx processing */
@@ -120,6 +121,7 @@ struct acm {
         unsigned char throttle;                         /* throttled by tty layer */
         unsigned char clocal;                           /* termios CLOCAL */
         unsigned int ctrl_caps;                         /* control capabilities from the class specific header */
+        unsigned int susp_count;                        /* number of suspended interfaces */
 };
 
 #define CDC_DATA_INTERFACE_TYPE 0x0a