[PATCH] USB: patches to acm driver

  - races with urb->current, union header evaluation, DMA handling
Signed-off-By: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/class/cdc-acm.h

@@ -86,17 +86,23 @@ struct acm {
 	struct usb_interface *data;			/* data interface */
 	struct tty_struct *tty;				/* the corresponding tty */
 	struct urb *ctrlurb, *readurb, *writeurb;	/* urbs */
+	u8 *ctrl_buffer, *read_buffer, *write_buffer;	/* buffers of urbs */
+	dma_addr_t ctrl_dma, read_dma, write_dma;	/* dma handles of buffers */
 	struct acm_line line;				/* line coding (bits, stop, parity) */
 	struct work_struct work;			/* work queue entry for line discipline waking up */
 	struct tasklet_struct bh;			/* rx processing */
+	spinlock_t throttle_lock;			/* synchronize throtteling and read callback */
 	unsigned int ctrlin;				/* input control lines (DCD, DSR, RI, break, overruns) */
 	unsigned int ctrlout;				/* output control lines (DTR, RTS) */
 	unsigned int writesize;				/* max packet size for the output bulk endpoint */
+	unsigned int readsize,ctrlsize;			/* buffer sizes for freeing */
 	unsigned int used;				/* someone has this acm's device open */
 	unsigned int minor;				/* acm minor number */
 	unsigned char throttle;				/* throttled by tty layer */
 	unsigned char clocal;				/* termios CLOCAL */
 	unsigned char ready_for_write;			/* write urb can be used */
+	unsigned char resubmit_to_unthrottle;		/* throtteling has disabled the read urb */
+	unsigned int ctrl_caps;				/* control capabilities from the class specific header */
 };
 
 /* "Union Functional Descriptor" from CDC spec 5.2.3.X */
@@ -110,6 +116,12 @@ struct union_desc {
 	/* ... and there could be other slave interfaces */
 } __attribute__ ((packed));
 
+/* class specific descriptor types */
+#define CDC_CALL_MANAGEMENT_TYPE	0x01
+#define CDC_AC_MANAGEMENT_TYPE		0x02
 #define CDC_UNION_TYPE			0x06
+#define CDC_COUNTRY_TYPE		0x07
+
 #define CDC_DATA_INTERFACE_TYPE	0x0a
 
+