1 files changed, 248 insertions, 152 deletions

diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c
index 707d9c94cf9e..178942a2ee61 100644
--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -109,6 +109,9 @@ struct bas_cardstate {
 
 	struct urb		*urb_int_in;	/* URB for interrupt pipe */
 	unsigned char		*int_in_buf;
+	struct work_struct	int_in_wq;	/* for usb_clear_halt() */
+	struct timer_list	timer_int_in;	/* int read retry delay */
+	int			retry_int_in;
 
 	spinlock_t		lock;		/* locks all following */
 	int			basstate;	/* bitmap (BS_*) */
@@ -169,7 +172,7 @@ static char *get_usb_rcmsg(int rc)
 	case -EAGAIN:
 		return "start frame too early or too much scheduled";
 	case -EFBIG:
-		return "too many isochronous frames requested";
+		return "too many isoc frames requested";
 	case -EPIPE:
 		return "endpoint stalled";
 	case -EMSGSIZE:
@@ -200,13 +203,13 @@ static char *get_usb_statmsg(int status)
 	case -ENOENT:
 		return "unlinked (sync)";
 	case -EINPROGRESS:
-		return "pending";
+		return "URB still pending";
 	case -EPROTO:
-		return "bit stuffing error, timeout, or unknown USB error";
+		return "bitstuff error, timeout, or unknown USB error";
 	case -EILSEQ:
 		return "CRC mismatch, timeout, or unknown USB error";
 	case -ETIME:
-		return "timed out";
+		return "USB response timeout";
 	case -EPIPE:
 		return "endpoint stalled";
 	case -ECOMM:
@@ -214,15 +217,15 @@ static char *get_usb_statmsg(int status)
 	case -ENOSR:
 		return "OUT buffer underrun";
 	case -EOVERFLOW:
-		return "too much data";
+		return "endpoint babble";
 	case -EREMOTEIO:
-		return "short packet detected";
+		return "short packet";
 	case -ENODEV:
 		return "device removed";
 	case -EXDEV:
-		return "partial isochronous transfer";
+		return "partial isoc transfer";
 	case -EINVAL:
-		return "invalid argument";
+		return "ISO madness";
 	case -ECONNRESET:
 		return "unlinked (async)";
 	case -ESHUTDOWN:
@@ -350,7 +353,7 @@ static inline void error_hangup(struct bc_state *bcs)
  * reset Gigaset device because of an unrecoverable error
  * This function may be called from any context, and takes care of
  * scheduling the necessary actions for execution outside of interrupt context.
- * cs->lock must not be held.
+ * cs->hw.bas->lock must not be held.
  * argument:
  *	controller state structure
  */
@@ -358,7 +361,9 @@ static inline void error_reset(struct cardstate *cs)
 {
 	/* reset interrupt pipe to recover (ignore errors) */
 	update_basstate(cs->hw.bas, BS_RESETTING, 0);
-	req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
+	if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
+		/* submission failed, escalate to USB port reset */
+		usb_queue_reset_device(cs->hw.bas->interface);
 }
 
 /* check_pending
@@ -438,23 +443,27 @@ static void cmd_in_timeout(unsigned long data)
 		return;
 	}
 
-	if (ucs->retry_cmd_in++ < BAS_RETRY) {
-		dev_notice(cs->dev, "control read: timeout, retry %d\n",
-			   ucs->retry_cmd_in);
-		rc = atread_submit(cs, BAS_TIMEOUT);
-		if (rc >= 0 || rc == -ENODEV)
-			/* resubmitted or disconnected */
-			/* - bypass regular exit block */
-			return;
-	} else {
+	if (ucs->retry_cmd_in++ >= BAS_RETRY) {
 		dev_err(cs->dev,
 			"control read: timeout, giving up after %d tries\n",
 			ucs->retry_cmd_in);
+		kfree(ucs->rcvbuf);
+		ucs->rcvbuf = NULL;
+		ucs->rcvbuf_size = 0;
+		error_reset(cs);
+		return;
+	}
+
+	gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
+		__func__, ucs->retry_cmd_in);
+	rc = atread_submit(cs, BAS_TIMEOUT);
+	if (rc < 0) {
+		kfree(ucs->rcvbuf);
+		ucs->rcvbuf = NULL;
+		ucs->rcvbuf_size = 0;
+		if (rc != -ENODEV)
+			error_reset(cs);
 	}
-	kfree(ucs->rcvbuf);
-	ucs->rcvbuf = NULL;
-	ucs->rcvbuf_size = 0;
-	error_reset(cs);
 }
 
 /* read_ctrl_callback
@@ -470,18 +479,11 @@ static void read_ctrl_callback(struct urb *urb)
 	struct cardstate *cs = inbuf->cs;
 	struct bas_cardstate *ucs = cs->hw.bas;
 	int status = urb->status;
-	int have_data = 0;
 	unsigned numbytes;
 	int rc;
 
 	update_basstate(ucs, 0, BS_ATRDPEND);
 	wake_up(&ucs->waitqueue);
-
-	if (!ucs->rcvbuf_size) {
-		dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
-		return;
-	}
-
 	del_timer(&ucs->timer_cmd_in);
 
 	switch (status) {
@@ -495,19 +497,10 @@ static void read_ctrl_callback(struct urb *urb)
 				numbytes = ucs->rcvbuf_size;
 		}
 
-		/* copy received bytes to inbuf */
-		have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
-
-		if (unlikely(numbytes < ucs->rcvbuf_size)) {
-			/* incomplete - resubmit for remaining bytes */
-			ucs->rcvbuf_size -= numbytes;
-			ucs->retry_cmd_in = 0;
-			rc = atread_submit(cs, BAS_TIMEOUT);
-			if (rc >= 0 || rc == -ENODEV)
-				/* resubmitted or disconnected */
-				/* - bypass regular exit block */
-				return;
-			error_reset(cs);
+		/* copy received bytes to inbuf, notify event layer */
+		if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
+			gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
+			gigaset_schedule_event(cs);
 		}
 		break;
 
@@ -516,37 +509,32 @@ static void read_ctrl_callback(struct urb *urb)
 	case -EINPROGRESS:		/* pending */
 	case -ENODEV:			/* device removed */
 	case -ESHUTDOWN:		/* device shut down */
-		/* no action necessary */
+		/* no further action necessary */
 		gig_dbg(DEBUG_USBREQ, "%s: %s",
 			__func__, get_usb_statmsg(status));
 		break;
 
-	default:			/* severe trouble */
-		dev_warn(cs->dev, "control read: %s\n",
-			 get_usb_statmsg(status));
+	default:			/* other errors: retry */
 		if (ucs->retry_cmd_in++ < BAS_RETRY) {
-			dev_notice(cs->dev, "control read: retry %d\n",
-				   ucs->retry_cmd_in);
+			gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
+				get_usb_statmsg(status), ucs->retry_cmd_in);
 			rc = atread_submit(cs, BAS_TIMEOUT);
-			if (rc >= 0 || rc == -ENODEV)
-				/* resubmitted or disconnected */
-				/* - bypass regular exit block */
+			if (rc >= 0)
+				/* successfully resubmitted, skip freeing */
 				return;
-		} else {
-			dev_err(cs->dev,
-				"control read: giving up after %d tries\n",
-				ucs->retry_cmd_in);
+			if (rc == -ENODEV)
+				/* disconnect, no further action necessary */
+				break;
 		}
+		dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
+			get_usb_statmsg(status), ucs->retry_cmd_in);
 		error_reset(cs);
 	}
 
+	/* read finished, free buffer */
 	kfree(ucs->rcvbuf);
 	ucs->rcvbuf = NULL;
 	ucs->rcvbuf_size = 0;
-	if (have_data) {
-		gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
-		gigaset_schedule_event(cs);
-	}
 }
 
 /* atread_submit
@@ -605,14 +593,67 @@ static int atread_submit(struct cardstate *cs, int timeout)
 
 	if (timeout > 0) {
 		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
-		ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
-		ucs->timer_cmd_in.data = (unsigned long) cs;
-		ucs->timer_cmd_in.function = cmd_in_timeout;
-		add_timer(&ucs->timer_cmd_in);
+		mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
 	}
 	return 0;
 }
 
+/* int_in_work
+ * workqueue routine to clear halt on interrupt in endpoint
+ */
+
+static void int_in_work(struct work_struct *work)
+{
+	struct bas_cardstate *ucs =
+		container_of(work, struct bas_cardstate, int_in_wq);
+	struct urb *urb = ucs->urb_int_in;
+	struct cardstate *cs = urb->context;
+	int rc;
+
+	/* clear halt condition */
+	rc = usb_clear_halt(ucs->udev, urb->pipe);
+	gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
+	if (rc == 0)
+		/* success, resubmit interrupt read URB */
+		rc = usb_submit_urb(urb, GFP_ATOMIC);
+	if (rc != 0 && rc != -ENODEV) {
+		dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
+		rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
+		if (rc == 0) {
+			rc = usb_reset_device(ucs->udev);
+			usb_unlock_device(ucs->udev);
+		}
+	}
+	ucs->retry_int_in = 0;
+}
+
+/* int_in_resubmit
+ * timer routine for interrupt read delayed resubmit
+ * argument:
+ *	controller state structure
+ */
+static void int_in_resubmit(unsigned long data)
+{
+	struct cardstate *cs = (struct cardstate *) data;
+	struct bas_cardstate *ucs = cs->hw.bas;
+	int rc;
+
+	if (ucs->retry_int_in++ >= BAS_RETRY) {
+		dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
+			ucs->retry_int_in);
+		usb_queue_reset_device(ucs->interface);
+		return;
+	}
+
+	gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
+	rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
+	if (rc != 0 && rc != -ENODEV) {
+		dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
+			get_usb_rcmsg(rc));
+		usb_queue_reset_device(ucs->interface);
+	}
+}
+
 /* read_int_callback
  * USB completion handler for interrupt pipe input
  * called by the USB subsystem in interrupt context
@@ -633,19 +674,29 @@ static void read_int_callback(struct urb *urb)
 
 	switch (status) {
 	case 0:			/* success */
+		ucs->retry_int_in = 0;
 		break;
+	case -EPIPE:			/* endpoint stalled */
+		schedule_work(&ucs->int_in_wq);
+		/* fall through */
 	case -ENOENT:			/* cancelled */
 	case -ECONNRESET:		/* cancelled (async) */
 	case -EINPROGRESS:		/* pending */
-		/* ignore silently */
+	case -ENODEV:			/* device removed */
+	case -ESHUTDOWN:		/* device shut down */
+		/* no further action necessary */
 		gig_dbg(DEBUG_USBREQ, "%s: %s",
 			__func__, get_usb_statmsg(status));
 		return;
-	case -ENODEV:			/* device removed */
-	case -ESHUTDOWN:		/* device shut down */
-		gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
+	case -EPROTO:			/* protocol error or unplug */
+	case -EILSEQ:
+	case -ETIME:
+		/* resubmit after delay */
+		gig_dbg(DEBUG_USBREQ, "%s: %s",
+			__func__, get_usb_statmsg(status));
+		mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
 		return;
-	default:		/* severe trouble */
+	default:		/* other errors: just resubmit */
 		dev_warn(cs->dev, "interrupt read: %s\n",
 			 get_usb_statmsg(status));
 		goto resubmit;
@@ -723,6 +774,13 @@ static void read_int_callback(struct urb *urb)
 			break;
 		}
 		spin_lock_irqsave(&cs->lock, flags);
+		if (ucs->basstate & BS_ATRDPEND) {
+			spin_unlock_irqrestore(&cs->lock, flags);
+			dev_warn(cs->dev,
+	"HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
+				 l, ucs->rcvbuf_size);
+			break;
+		}
 		if (ucs->rcvbuf_size) {
 			/* throw away previous buffer - we have no queue */
 			dev_err(cs->dev,
@@ -735,7 +793,6 @@ static void read_int_callback(struct urb *urb)
 		if (ucs->rcvbuf == NULL) {
 			spin_unlock_irqrestore(&cs->lock, flags);
 			dev_err(cs->dev, "out of memory receiving AT data\n");
-			error_reset(cs);
 			break;
 		}
 		ucs->rcvbuf_size = l;
@@ -745,13 +802,10 @@ static void read_int_callback(struct urb *urb)
 			kfree(ucs->rcvbuf);
 			ucs->rcvbuf = NULL;
 			ucs->rcvbuf_size = 0;
-			if (rc != -ENODEV) {
-				spin_unlock_irqrestore(&cs->lock, flags);
-				error_reset(cs);
-				break;
-			}
 		}
 		spin_unlock_irqrestore(&cs->lock, flags);
+		if (rc < 0 && rc != -ENODEV)
+			error_reset(cs);
 		break;
 
 	case HD_RESET_INTERRUPT_PIPE_ACK:
@@ -818,6 +872,7 @@ static void read_iso_callback(struct urb *urb)
 		tasklet_hi_schedule(&ubc->rcvd_tasklet);
 	} else {
 		/* tasklet still busy, drop data and resubmit URB */
+		gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
 		ubc->loststatus = status;
 		for (i = 0; i < BAS_NUMFRAMES; i++) {
 			ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
@@ -833,13 +888,11 @@ static void read_iso_callback(struct urb *urb)
 			urb->dev = bcs->cs->hw.bas->udev;
 			urb->transfer_flags = URB_ISO_ASAP;
 			urb->number_of_packets = BAS_NUMFRAMES;
-			gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
-				__func__);
 			rc = usb_submit_urb(urb, GFP_ATOMIC);
 			if (unlikely(rc != 0 && rc != -ENODEV)) {
 				dev_err(bcs->cs->dev,
-					"could not resubmit isochronous read "
-					"URB: %s\n", get_usb_rcmsg(rc));
+				       "could not resubmit isoc read URB: %s\n",
+					get_usb_rcmsg(rc));
 				dump_urb(DEBUG_ISO, "isoc read", urb);
 				error_hangup(bcs);
 			}
@@ -1081,7 +1134,7 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 			gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
 		else
 			dev_err(ucx->bcs->cs->dev,
-				"could not submit isochronous write URB: %s\n",
+				"could not submit isoc write URB: %s\n",
 				get_usb_rcmsg(rc));
 		return rc;
 	}
@@ -1126,7 +1179,7 @@ static void write_iso_tasklet(unsigned long data)
 		ubc->isooutovfl = NULL;
 		spin_unlock_irqrestore(&ubc->isooutlock, flags);
 		if (ovfl) {
-			dev_err(cs->dev, "isochronous write buffer underrun\n");
+			dev_err(cs->dev, "isoc write underrun\n");
 			error_hangup(bcs);
 			break;
 		}
@@ -1151,7 +1204,7 @@ static void write_iso_tasklet(unsigned long data)
 				if (next) {
 					/* couldn't put it back */
 					dev_err(cs->dev,
-					      "losing isochronous write URB\n");
+						"losing isoc write URB\n");
 					error_hangup(bcs);
 				}
 			}
@@ -1178,10 +1231,10 @@ static void write_iso_tasklet(unsigned long data)
 				if (ifd->status ||
 				    ifd->actual_length != ifd->length) {
 					dev_warn(cs->dev,
-					     "isochronous write: frame %d: %s, "
-					     "only %d of %d bytes sent\n",
-					     i, get_usb_statmsg(ifd->status),
-					     ifd->actual_length, ifd->length);
+					    "isoc write: frame %d[%d/%d]: %s\n",
+						 i, ifd->actual_length,
+						 ifd->length,
+						 get_usb_statmsg(ifd->status));
 					offset = (ifd->offset +
 						  ifd->actual_length)
 						 % BAS_OUTBUFSIZE;
@@ -1190,11 +1243,11 @@ static void write_iso_tasklet(unsigned long data)
 			}
 			break;
 		case -EPIPE:			/* stall - probably underrun */
-			dev_err(cs->dev, "isochronous write stalled\n");
+			dev_err(cs->dev, "isoc write: stalled\n");
 			error_hangup(bcs);
 			break;
-		default:			/* severe trouble */
-			dev_warn(cs->dev, "isochronous write: %s\n",
+		default:			/* other errors */
+			dev_warn(cs->dev, "isoc write: %s\n",
 				 get_usb_statmsg(status));
 		}
 
@@ -1250,6 +1303,7 @@ static void read_iso_tasklet(unsigned long data)
 	struct cardstate *cs = bcs->cs;
 	struct urb *urb;
 	int status;
+	struct usb_iso_packet_descriptor *ifd;
 	char *rcvbuf;
 	unsigned long flags;
 	int totleft, numbytes, offset, frame, rc;
@@ -1267,8 +1321,7 @@ static void read_iso_tasklet(unsigned long data)
 		ubc->isoindone = NULL;
 		if (unlikely(ubc->loststatus != -EINPROGRESS)) {
 			dev_warn(cs->dev,
-				 "isochronous read overrun, "
-				 "dropped URB with status: %s, %d bytes lost\n",
+		"isoc read overrun, URB dropped (status: %s, %d bytes)\n",
 				 get_usb_statmsg(ubc->loststatus),
 				 ubc->isoinlost);
 			ubc->loststatus = -EINPROGRESS;
@@ -1298,11 +1351,11 @@ static void read_iso_tasklet(unsigned long data)
 				__func__, get_usb_statmsg(status));
 			continue;		/* -> skip */
 		case -EPIPE:
-			dev_err(cs->dev, "isochronous read stalled\n");
+			dev_err(cs->dev, "isoc read: stalled\n");
 			error_hangup(bcs);
 			continue;		/* -> skip */
-		default:			/* severe trouble */
-			dev_warn(cs->dev, "isochronous read: %s\n",
+		default:			/* other error */
+			dev_warn(cs->dev, "isoc read: %s\n",
 				 get_usb_statmsg(status));
 			goto error;
 		}
@@ -1310,40 +1363,52 @@ static void read_iso_tasklet(unsigned long data)
 		rcvbuf = urb->transfer_buffer;
 		totleft = urb->actual_length;
 		for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
-			numbytes = urb->iso_frame_desc[frame].actual_length;
-			if (unlikely(urb->iso_frame_desc[frame].status))
+			ifd = &urb->iso_frame_desc[frame];
+			numbytes = ifd->actual_length;
+			switch (ifd->status) {
+			case 0:			/* success */
+				break;
+			case -EPROTO:		/* protocol error or unplug */
+			case -EILSEQ:
+			case -ETIME:
+				/* probably just disconnected, ignore */
+				gig_dbg(DEBUG_ISO,
+					"isoc read: frame %d[%d]: %s\n",
+					frame, numbytes,
+					get_usb_statmsg(ifd->status));
+				break;
+			default:		/* other error */
+				/* report, assume transferred bytes are ok */
 				dev_warn(cs->dev,
-					 "isochronous read: frame %d[%d]: %s\n",
+					 "isoc read: frame %d[%d]: %s\n",
 					 frame, numbytes,
-					 get_usb_statmsg(
-					    urb->iso_frame_desc[frame].status));
+					 get_usb_statmsg(ifd->status));
+			}
 			if (unlikely(numbytes > BAS_MAXFRAME))
 				dev_warn(cs->dev,
-					 "isochronous read: frame %d: "
-					 "numbytes (%d) > BAS_MAXFRAME\n",
-					 frame, numbytes);
+					 "isoc read: frame %d[%d]: %s\n",
+					 frame, numbytes,
+					 "exceeds max frame size");
 			if (unlikely(numbytes > totleft)) {
 				dev_warn(cs->dev,
-					 "isochronous read: frame %d: "
-					 "numbytes (%d) > totleft (%d)\n",
-					 frame, numbytes, totleft);
+					 "isoc read: frame %d[%d]: %s\n",
+					 frame, numbytes,
+					 "exceeds total transfer length");
 				numbytes = totleft;
 			}
-			offset = urb->iso_frame_desc[frame].offset;
+			offset = ifd->offset;
 			if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
 				dev_warn(cs->dev,
-					 "isochronous read: frame %d: "
-					 "offset (%d) + numbytes (%d) "
-					 "> BAS_INBUFSIZE\n",
-					 frame, offset, numbytes);
+					 "isoc read: frame %d[%d]: %s\n",
+					 frame, numbytes,
+					 "exceeds end of buffer");
 				numbytes = BAS_INBUFSIZE - offset;
 			}
 			gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
 			totleft -= numbytes;
 		}
 		if (unlikely(totleft > 0))
-			dev_warn(cs->dev,
-				 "isochronous read: %d data bytes missing\n",
+			dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
 				 totleft);
 
 error:
@@ -1359,9 +1424,9 @@ error:
 		rc = usb_submit_urb(urb, GFP_ATOMIC);
 		if (unlikely(rc != 0 && rc != -ENODEV)) {
 			dev_err(cs->dev,
-				"could not resubmit isochronous read URB: %s\n",
+				"could not resubmit isoc read URB: %s\n",
 				get_usb_rcmsg(rc));
-			dump_urb(DEBUG_ISO, "resubmit iso read", urb);
+			dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
 			error_hangup(bcs);
 		}
 	}
@@ -1373,12 +1438,12 @@ error:
 /* req_timeout
  * timeout routine for control output request
  * argument:
- *	B channel control structure
+ *	controller state structure
  */
 static void req_timeout(unsigned long data)
 {
-	struct bc_state *bcs = (struct bc_state *) data;
-	struct bas_cardstate *ucs = bcs->cs->hw.bas;
+	struct cardstate *cs = (struct cardstate *) data;
+	struct bas_cardstate *ucs = cs->hw.bas;
 	int pending;
 	unsigned long flags;
 
@@ -1395,38 +1460,44 @@ static void req_timeout(unsigned long data)
 		break;
 
 	case HD_OPEN_ATCHANNEL:
-		dev_err(bcs->cs->dev, "timeout opening AT channel\n");
-		error_reset(bcs->cs);
+		dev_err(cs->dev, "timeout opening AT channel\n");
+		error_reset(cs);
 		break;
 
-	case HD_OPEN_B2CHANNEL:
 	case HD_OPEN_B1CHANNEL:
-		dev_err(bcs->cs->dev, "timeout opening channel %d\n",
-			bcs->channel + 1);
-		error_hangup(bcs);
+		dev_err(cs->dev, "timeout opening channel 1\n");
+		error_hangup(&cs->bcs[0]);
+		break;
+
+	case HD_OPEN_B2CHANNEL:
+		dev_err(cs->dev, "timeout opening channel 2\n");
+		error_hangup(&cs->bcs[1]);
 		break;
 
 	case HD_CLOSE_ATCHANNEL:
-		dev_err(bcs->cs->dev, "timeout closing AT channel\n");
-		error_reset(bcs->cs);
+		dev_err(cs->dev, "timeout closing AT channel\n");
+		error_reset(cs);
 		break;
 
-	case HD_CLOSE_B2CHANNEL:
 	case HD_CLOSE_B1CHANNEL:
-		dev_err(bcs->cs->dev, "timeout closing channel %d\n",
-			bcs->channel + 1);
-		error_reset(bcs->cs);
+		dev_err(cs->dev, "timeout closing channel 1\n");
+		error_reset(cs);
+		break;
+
+	case HD_CLOSE_B2CHANNEL:
+		dev_err(cs->dev, "timeout closing channel 2\n");
+		error_reset(cs);
 		break;
 
 	case HD_RESET_INTERRUPT_PIPE:
 		/* error recovery escalation */
-		dev_err(bcs->cs->dev,
+		dev_err(cs->dev,
 			"reset interrupt pipe timeout, attempting USB reset\n");
-		usb_queue_reset_device(bcs->cs->hw.bas->interface);
+		usb_queue_reset_device(ucs->interface);
 		break;
 
 	default:
-		dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
+		dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
 			 pending);
 	}
 
@@ -1557,10 +1628,7 @@ static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
 
 	if (timeout > 0) {
 		gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
-		ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
-		ucs->timer_ctrl.data = (unsigned long) bcs;
-		ucs->timer_ctrl.function = req_timeout;
-		add_timer(&ucs->timer_ctrl);
+		mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
 	}
 
 	spin_unlock_irqrestore(&ucs->lock, flags);
@@ -1590,21 +1658,20 @@ static int gigaset_init_bchannel(struct bc_state *bcs)
 
 	if (cs->hw.bas->basstate & BS_SUSPEND) {
 		dev_notice(cs->dev,
-			   "not starting isochronous I/O, "
-			   "suspend in progress\n");
+			   "not starting isoc I/O, suspend in progress\n");
 		spin_unlock_irqrestore(&cs->lock, flags);
 		return -EHOSTUNREACH;
 	}
 
 	ret = starturbs(bcs);
 	if (ret < 0) {
+		spin_unlock_irqrestore(&cs->lock, flags);
 		dev_err(cs->dev,
-			"could not start isochronous I/O for channel B%d: %s\n",
+			"could not start isoc I/O for channel B%d: %s\n",
 			bcs->channel + 1,
 			ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
 		if (ret != -ENODEV)
 			error_hangup(bcs);
-		spin_unlock_irqrestore(&cs->lock, flags);
 		return ret;
 	}
 
@@ -1614,11 +1681,11 @@ static int gigaset_init_bchannel(struct bc_state *bcs)
 		dev_err(cs->dev, "could not open channel B%d\n",
 			bcs->channel + 1);
 		stopurbs(bcs->hw.bas);
-		if (ret != -ENODEV)
-			error_hangup(bcs);
 	}
 
 	spin_unlock_irqrestore(&cs->lock, flags);
+	if (ret < 0 && ret != -ENODEV)
+		error_hangup(bcs);
 	return ret;
 }
 
@@ -1826,10 +1893,7 @@ static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
 	if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
 		gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
 			ATRDY_TIMEOUT);
-		ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
-		ucs->timer_atrdy.data = (unsigned long) cs;
-		ucs->timer_atrdy.function = atrdy_timeout;
-		add_timer(&ucs->timer_atrdy);
+		mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
 	}
 	return 0;
 }
@@ -1914,6 +1978,28 @@ static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
 	 * The next command will reopen the AT channel automatically.
 	 */
 	if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
+		/* If an HD_RECEIVEATDATA_ACK message remains unhandled
+		 * because of an error, the base never sends another one.
+		 * The response channel is thus effectively blocked.
+		 * Closing and reopening the AT channel does *not* clear
+		 * this condition.
+		 * As a stopgap measure, submit a zero-length AT read
+		 * before closing the AT channel. This has the undocumented
+		 * effect of triggering a new HD_RECEIVEATDATA_ACK message
+		 * from the base if necessary.
+		 * The subsequent AT channel close then discards any pending
+		 * messages.
+		 */
+		spin_lock_irqsave(&cs->lock, flags);
+		if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
+			kfree(cs->hw.bas->rcvbuf);
+			cs->hw.bas->rcvbuf = NULL;
+			cs->hw.bas->rcvbuf_size = 0;
+			cs->hw.bas->retry_cmd_in = 0;
+			atread_submit(cs, 0);
+		}
+		spin_unlock_irqrestore(&cs->lock, flags);
+
 		rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
 		if (cb->wake_tasklet)
 			tasklet_schedule(cb->wake_tasklet);
@@ -2010,7 +2096,7 @@ static int gigaset_freebcshw(struct bc_state *bcs)
 
 	/* kill URBs and tasklets before freeing - better safe than sorry */
 	ubc->running = 0;
-	gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
+	gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
 	for (i = 0; i < BAS_OUTURBS; ++i) {
 		usb_kill_urb(ubc->isoouturbs[i].urb);
 		usb_free_urb(ubc->isoouturbs[i].urb);
@@ -2131,10 +2217,12 @@ static int gigaset_initcshw(struct cardstate *cs)
 	ucs->pending = 0;
 
 	ucs->basstate = 0;
-	init_timer(&ucs->timer_ctrl);
-	init_timer(&ucs->timer_atrdy);
-	init_timer(&ucs->timer_cmd_in);
+	setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
+	setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
+	setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
+	setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
 	init_waitqueue_head(&ucs->waitqueue);
+	INIT_WORK(&ucs->int_in_wq, int_in_work);
 
 	return 1;
 }
@@ -2282,6 +2370,7 @@ static int gigaset_probe(struct usb_interface *interface,
 			get_usb_rcmsg(rc));
 		goto error;
 	}
+	ucs->retry_int_in = 0;
 
 	/* tell the device that the driver is ready */
 	rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
@@ -2334,10 +2423,12 @@ static void gigaset_disconnect(struct usb_interface *interface)
 	/* stop driver (common part) */
 	gigaset_stop(cs);
 
-	/* stop timers and URBs, free ressources */
+	/* stop delayed work and URBs, free ressources */
 	del_timer_sync(&ucs->timer_ctrl);
 	del_timer_sync(&ucs->timer_atrdy);
 	del_timer_sync(&ucs->timer_cmd_in);
+	del_timer_sync(&ucs->timer_int_in);
+	cancel_work_sync(&ucs->int_in_wq);
 	freeurbs(cs);
 	usb_set_intfdata(interface, NULL);
 	kfree(ucs->rcvbuf);
@@ -2400,10 +2491,14 @@ static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
 		/* in case of timeout, proceed anyway */
 	}
 
-	/* kill all URBs and timers that might still be pending */
+	/* kill all URBs and delayed work that might still be pending */
 	usb_kill_urb(ucs->urb_ctrl);
 	usb_kill_urb(ucs->urb_int_in);
 	del_timer_sync(&ucs->timer_ctrl);
+	del_timer_sync(&ucs->timer_atrdy);
+	del_timer_sync(&ucs->timer_cmd_in);
+	del_timer_sync(&ucs->timer_int_in);
+	cancel_work_sync(&ucs->int_in_wq);
 
 	gig_dbg(DEBUG_SUSPEND, "suspend complete");
 	return 0;
@@ -2425,6 +2520,7 @@ static int gigaset_resume(struct usb_interface *intf)
 			get_usb_rcmsg(rc));
 		return rc;
 	}
+	ucs->retry_int_in = 0;
 
 	/* clear suspend flag to reallow activity */
 	update_basstate(ucs, 0, BS_SUSPEND);