The early generations with this trackpad used the separate mouse interface to produce button events. With the introduction of the button pads, this information was moved to the trackpad interface, leaving the mouse interface unused. The driver is still setting up both interfaces, which has not caused any problems - until now.
It turns out that without the CONFIG_USB_EHCI_TT_NEWSCHED option, the driver may return an ENOSPC upon bt_urb submission, resulting in a failure to open the device. This happens everytime on the MacBookPro Retina (and likely on other mid-2012 models), but earlier MacBook models seem to work fine. This patch skips the bt_urb setup for TYPE2 devices, which arguably should have been done in the first place. Signed-off-by: Henrik Rydberg <rydb...@euromail.se> --- drivers/input/mouse/bcm5974.c | 43 ++++++++++++++++++++++++++----------------- 1 file changed, 26 insertions(+), 17 deletions(-) diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c index d528c23..39ac9ff 100644 --- a/drivers/input/mouse/bcm5974.c +++ b/drivers/input/mouse/bcm5974.c @@ -742,9 +742,11 @@ static int bcm5974_start_traffic(struct bcm5974 *dev) goto err_out; } - error = usb_submit_urb(dev->bt_urb, GFP_KERNEL); - if (error) - goto err_reset_mode; + if (dev->bt_urb) { + error = usb_submit_urb(dev->bt_urb, GFP_KERNEL); + if (error) + goto err_reset_mode; + } error = usb_submit_urb(dev->tp_urb, GFP_KERNEL); if (error) @@ -868,19 +870,23 @@ static int bcm5974_probe(struct usb_interface *iface, mutex_init(&dev->pm_mutex); /* setup urbs */ - dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL); - if (!dev->bt_urb) - goto err_free_devs; + if (cfg->tp_type == TYPE1) { + dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->bt_urb) + goto err_free_devs; + } dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL); if (!dev->tp_urb) goto err_free_bt_urb; - dev->bt_data = usb_alloc_coherent(dev->udev, + if (dev->bt_urb) { + dev->bt_data = usb_alloc_coherent(dev->udev, dev->cfg.bt_datalen, GFP_KERNEL, &dev->bt_urb->transfer_dma); - if (!dev->bt_data) - goto err_free_urb; + if (!dev->bt_data) + goto err_free_urb; + } dev->tp_data = usb_alloc_coherent(dev->udev, dev->cfg.tp_datalen, GFP_KERNEL, @@ -888,10 +894,11 @@ static int bcm5974_probe(struct usb_interface *iface, if (!dev->tp_data) goto err_free_bt_buffer; - usb_fill_int_urb(dev->bt_urb, udev, - usb_rcvintpipe(udev, cfg->bt_ep), - dev->bt_data, dev->cfg.bt_datalen, - bcm5974_irq_button, dev, 1); + if (dev->bt_urb) + usb_fill_int_urb(dev->bt_urb, udev, + usb_rcvintpipe(udev, cfg->bt_ep), + dev->bt_data, dev->cfg.bt_datalen, + bcm5974_irq_button, dev, 1); usb_fill_int_urb(dev->tp_urb, udev, usb_rcvintpipe(udev, cfg->tp_ep), @@ -929,8 +936,9 @@ err_free_buffer: usb_free_coherent(dev->udev, dev->cfg.tp_datalen, dev->tp_data, dev->tp_urb->transfer_dma); err_free_bt_buffer: - usb_free_coherent(dev->udev, dev->cfg.bt_datalen, - dev->bt_data, dev->bt_urb->transfer_dma); + if (dev->bt_urb) + usb_free_coherent(dev->udev, dev->cfg.bt_datalen, + dev->bt_data, dev->bt_urb->transfer_dma); err_free_urb: usb_free_urb(dev->tp_urb); err_free_bt_urb: @@ -951,8 +959,9 @@ static void bcm5974_disconnect(struct usb_interface *iface) input_unregister_device(dev->input); usb_free_coherent(dev->udev, dev->cfg.tp_datalen, dev->tp_data, dev->tp_urb->transfer_dma); - usb_free_coherent(dev->udev, dev->cfg.bt_datalen, - dev->bt_data, dev->bt_urb->transfer_dma); + if (dev->bt_urb) + usb_free_coherent(dev->udev, dev->cfg.bt_datalen, + dev->bt_data, dev->bt_urb->transfer_dma); usb_free_urb(dev->tp_urb); usb_free_urb(dev->bt_urb); kfree(dev); -- 1.7.12 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/