1 files changed, 70 insertions, 50 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 39ddb5585ded..3fda1ec961d7 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -147,17 +147,29 @@ static inline int acm_set_control(struct acm *acm, int control)
 #define acm_send_break(acm, ms) \
 	acm_ctrl_msg(acm, USB_CDC_REQ_SEND_BREAK, ms, NULL, 0)
 
-static void acm_kill_urbs(struct acm *acm)
+static void acm_poison_urbs(struct acm *acm)
 {
 	int i;
 
-	usb_kill_urb(acm->ctrlurb);
+	usb_poison_urb(acm->ctrlurb);
 	for (i = 0; i < ACM_NW; i++)
-		usb_kill_urb(acm->wb[i].urb);
+		usb_poison_urb(acm->wb[i].urb);
 	for (i = 0; i < acm->rx_buflimit; i++)
-		usb_kill_urb(acm->read_urbs[i]);
+		usb_poison_urb(acm->read_urbs[i]);
+}
+
+static void acm_unpoison_urbs(struct acm *acm)
+{
+	int i;
+
+	for (i = 0; i < acm->rx_buflimit; i++)
+		usb_unpoison_urb(acm->read_urbs[i]);
+	for (i = 0; i < ACM_NW; i++)
+		usb_unpoison_urb(acm->wb[i].urb);
+	usb_unpoison_urb(acm->ctrlurb);
 }
 
+
 /*
  * Write buffer management.
  * All of these assume proper locks taken by the caller.
@@ -226,9 +238,10 @@ static int acm_start_wb(struct acm *acm, struct acm_wb *wb)
 
 	rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
 	if (rc < 0) {
-		dev_err(&acm->data->dev,
-			"%s - usb_submit_urb(write bulk) failed: %d\n",
-			__func__, rc);
+		if (rc != -EPERM)
+			dev_err(&acm->data->dev,
+				"%s - usb_submit_urb(write bulk) failed: %d\n",
+				__func__, rc);
 		acm_write_done(acm, wb);
 	}
 	return rc;
@@ -313,8 +326,10 @@ static void acm_process_notification(struct acm *acm, unsigned char *buf)
 			acm->iocount.dsr++;
 		if (difference & ACM_CTRL_DCD)
 			acm->iocount.dcd++;
-		if (newctrl & ACM_CTRL_BRK)
+		if (newctrl & ACM_CTRL_BRK) {
 			acm->iocount.brk++;
+			tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
+		}
 		if (newctrl & ACM_CTRL_RI)
 			acm->iocount.rng++;
 		if (newctrl & ACM_CTRL_FRAMING)
@@ -480,11 +495,6 @@ static void acm_read_bulk_callback(struct urb *urb)
 	dev_vdbg(&acm->data->dev, "got urb %d, len %d, status %d\n",
 		rb->index, urb->actual_length, status);
 
-	if (!acm->dev) {
-		dev_dbg(&acm->data->dev, "%s - disconnected\n", __func__);
-		return;
-	}
-
 	switch (status) {
 	case 0:
 		usb_mark_last_busy(acm->dev);
@@ -649,7 +659,8 @@ static void acm_port_dtr_rts(struct tty_port *port, int raise)
 
 	res = acm_set_control(acm, val);
 	if (res && (acm->ctrl_caps & USB_CDC_CAP_LINE))
-		dev_err(&acm->control->dev, "failed to set dtr/rts\n");
+		/* This is broken in too many devices to spam the logs */
+		dev_dbg(&acm->control->dev, "failed to set dtr/rts\n");
 }
 
 static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
@@ -731,6 +742,7 @@ static void acm_port_shutdown(struct tty_port *port)
 	 * Need to grab write_lock to prevent race with resume, but no need to
 	 * hold it due to the tty-port initialised flag.
 	 */
+	acm_poison_urbs(acm);
 	spin_lock_irq(&acm->write_lock);
 	spin_unlock_irq(&acm->write_lock);
 
@@ -747,7 +759,8 @@ static void acm_port_shutdown(struct tty_port *port)
 		usb_autopm_put_interface_async(acm->control);
 	}
 
-	acm_kill_urbs(acm);
+	acm_unpoison_urbs(acm);
+
 }
 
 static void acm_tty_cleanup(struct tty_struct *tty)
@@ -1296,13 +1309,6 @@ skip_normal_probe:
 	if (!combined_interfaces && intf != control_interface)
 		return -ENODEV;
 
-	if (!combined_interfaces && usb_interface_claimed(data_interface)) {
-		/* valid in this context */
-		dev_dbg(&intf->dev, "The data interface isn't available\n");
-		return -EBUSY;
-	}
-
-
 	if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
 	    control_interface->cur_altsetting->desc.bNumEndpoints == 0)
 		return -EINVAL;
@@ -1323,8 +1329,8 @@ made_compressed_probe:
 	dev_dbg(&intf->dev, "interfaces are valid\n");
 
 	acm = kzalloc(sizeof(struct acm), GFP_KERNEL);
-	if (acm == NULL)
-		goto alloc_fail;
+	if (!acm)
+		return -ENOMEM;
 
 	tty_port_init(&acm->port);
 	acm->port.ops = &acm_port_ops;
@@ -1341,7 +1347,7 @@ made_compressed_probe:
 
 	minor = acm_alloc_minor(acm);
 	if (minor < 0)
-		goto alloc_fail1;
+		goto err_put_port;
 
 	acm->minor = minor;
 	acm->dev = usb_dev;
@@ -1372,15 +1378,15 @@ made_compressed_probe:
 
 	buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma);
 	if (!buf)
-		goto alloc_fail1;
+		goto err_put_port;
 	acm->ctrl_buffer = buf;
 
 	if (acm_write_buffers_alloc(acm) < 0)
-		goto alloc_fail2;
+		goto err_free_ctrl_buffer;
 
 	acm->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!acm->ctrlurb)
-		goto alloc_fail3;
+		goto err_free_write_buffers;
 
 	for (i = 0; i < num_rx_buf; i++) {
 		struct acm_rb *rb = &(acm->read_buffers[i]);
@@ -1389,13 +1395,13 @@ made_compressed_probe:
 		rb->base = usb_alloc_coherent(acm->dev, readsize, GFP_KERNEL,
 								&rb->dma);
 		if (!rb->base)
-			goto alloc_fail4;
+			goto err_free_read_urbs;
 		rb->index = i;
 		rb->instance = acm;
 
 		urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (!urb)
-			goto alloc_fail4;
+			goto err_free_read_urbs;
 
 		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 		urb->transfer_dma = rb->dma;
@@ -1416,8 +1422,8 @@ made_compressed_probe:
 		struct acm_wb *snd = &(acm->wb[i]);
 
 		snd->urb = usb_alloc_urb(0, GFP_KERNEL);
-		if (snd->urb == NULL)
-			goto alloc_fail5;
+		if (!snd->urb)
+			goto err_free_write_urbs;
 
 		if (usb_endpoint_xfer_int(epwrite))
 			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
@@ -1435,7 +1441,7 @@ made_compressed_probe:
 
 	i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
 	if (i < 0)
-		goto alloc_fail5;
+		goto err_free_write_urbs;
 
 	if (h.usb_cdc_country_functional_desc) { /* export the country data */
 		struct usb_cdc_country_functional_desc * cfd =
@@ -1480,20 +1486,21 @@ skip_countries:
 	acm->nb_index = 0;
 	acm->nb_size = 0;
 
-	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
-
 	acm->line.dwDTERate = cpu_to_le32(9600);
 	acm->line.bDataBits = 8;
 	acm_set_line(acm, &acm->line);
 
-	usb_driver_claim_interface(&acm_driver, data_interface, acm);
-	usb_set_intfdata(data_interface, acm);
+	if (!acm->combined_interfaces) {
+		rv = usb_driver_claim_interface(&acm_driver, data_interface, acm);
+		if (rv)
+			goto err_remove_files;
+	}
 
 	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
 			&control_interface->dev);
 	if (IS_ERR(tty_dev)) {
 		rv = PTR_ERR(tty_dev);
-		goto alloc_fail6;
+		goto err_release_data_interface;
 	}
 
 	if (quirks & CLEAR_HALT_CONDITIONS) {
@@ -1501,32 +1508,39 @@ skip_countries:
 		usb_clear_halt(usb_dev, acm->out);
 	}
 
+	dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
+
 	return 0;
-alloc_fail6:
+
+err_release_data_interface:
+	if (!acm->combined_interfaces) {
+		/* Clear driver data so that disconnect() returns early. */
+		usb_set_intfdata(data_interface, NULL);
+		usb_driver_release_interface(&acm_driver, data_interface);
+	}
+err_remove_files:
 	if (acm->country_codes) {
 		device_remove_file(&acm->control->dev,
 				&dev_attr_wCountryCodes);
 		device_remove_file(&acm->control->dev,
 				&dev_attr_iCountryCodeRelDate);
-		kfree(acm->country_codes);
 	}
 	device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities);
-alloc_fail5:
-	usb_set_intfdata(intf, NULL);
+err_free_write_urbs:
 	for (i = 0; i < ACM_NW; i++)
 		usb_free_urb(acm->wb[i].urb);
-alloc_fail4:
+err_free_read_urbs:
 	for (i = 0; i < num_rx_buf; i++)
 		usb_free_urb(acm->read_urbs[i]);
 	acm_read_buffers_free(acm);
 	usb_free_urb(acm->ctrlurb);
-alloc_fail3:
+err_free_write_buffers:
 	acm_write_buffers_free(acm);
-alloc_fail2:
+err_free_ctrl_buffer:
 	usb_free_coherent(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);
-alloc_fail1:
+err_put_port:
 	tty_port_put(&acm->port);
-alloc_fail:
+
 	return rv;
 }
 
@@ -1540,8 +1554,14 @@ static void acm_disconnect(struct usb_interface *intf)
 	if (!acm)
 		return;
 
-	mutex_lock(&acm->mutex);
 	acm->disconnected = true;
+	/*
+	 * there is a circular dependency. acm_softint() can resubmit
+	 * the URBs in error handling so we need to block any
+	 * submission right away
+	 */
+	acm_poison_urbs(acm);
+	mutex_lock(&acm->mutex);
 	if (acm->country_codes) {
 		device_remove_file(&acm->control->dev,
 				&dev_attr_wCountryCodes);
@@ -1560,7 +1580,6 @@ static void acm_disconnect(struct usb_interface *intf)
 		tty_kref_put(tty);
 	}
 
-	acm_kill_urbs(acm);
 	cancel_delayed_work_sync(&acm->dwork);
 
 	tty_unregister_device(acm_tty_driver, acm->minor);
@@ -1602,7 +1621,7 @@ static int acm_suspend(struct usb_interface *intf, pm_message_t message)
 	if (cnt)
 		return 0;
 
-	acm_kill_urbs(acm);
+	acm_poison_urbs(acm);
 	cancel_delayed_work_sync(&acm->dwork);
 	acm->urbs_in_error_delay = 0;
 
@@ -1615,6 +1634,7 @@ static int acm_resume(struct usb_interface *intf)
 	struct urb *urb;
 	int rv = 0;
 
+	acm_unpoison_urbs(acm);
 	spin_lock_irq(&acm->write_lock);
 
 	if (--acm->susp_count)