diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hub.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 5d859fc0761..3b7ca181cd7 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -4944,7 +4944,8 @@ void usb_hub_cleanup(void) } /* usb_hub_cleanup() */ static int descriptors_changed(struct usb_device *udev, - struct usb_device_descriptor *old_device_descriptor) + struct usb_device_descriptor *old_device_descriptor, + struct usb_host_bos *old_bos) { int changed = 0; unsigned index; @@ -4958,6 +4959,16 @@ static int descriptors_changed(struct usb_device *udev, sizeof(*old_device_descriptor)) != 0) return 1; + if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) + return 1; + if (udev->bos) { + len = udev->bos->desc->wTotalLength; + if (len != old_bos->desc->wTotalLength) + return 1; + if (memcmp(udev->bos->desc, old_bos->desc, le16_to_cpu(len))) + return 1; + } + /* Since the idVendor, idProduct, and bcdDevice values in the * device descriptor haven't changed, we will assume the * Manufacturer and Product strings haven't changed either. @@ -5054,6 +5065,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev) struct usb_hub *parent_hub; struct usb_hcd *hcd = bus_to_hcd(udev->bus); struct usb_device_descriptor descriptor = udev->descriptor; + struct usb_host_bos *bos; int i, ret = 0; int port1 = udev->portnum; @@ -5071,6 +5083,9 @@ static int usb_reset_and_verify_device(struct usb_device *udev) } parent_hub = usb_hub_to_struct_hub(parent_hdev); + bos = udev->bos; + udev->bos = NULL; + /* Disable LPM and LTM while we reset the device and reinstall the alt * settings. Device-initiated LPM settings, and system exit latency * settings are cleared when the device is reset, so we have to set @@ -5104,7 +5119,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev) goto re_enumerate; /* Device might have changed firmware (DFU or similar) */ - if (descriptors_changed(udev, &descriptor)) { + if (descriptors_changed(udev, &descriptor, bos)) { dev_info(&udev->dev, "device firmware changed\n"); udev->descriptor = descriptor; /* for disconnect() calls */ goto re_enumerate; @@ -5177,11 +5192,15 @@ done: /* Now that the alt settings are re-installed, enable LTM and LPM. */ usb_unlocked_enable_lpm(udev); usb_enable_ltm(udev); + usb_release_bos_descriptor(udev); + udev->bos = bos; return 0; re_enumerate: /* LPM state doesn't matter when we're about to destroy the device. */ hub_port_logical_disconnect(parent_hub, port1); + usb_release_bos_descriptor(udev); + udev->bos = bos; return -ENODEV; } |