diff options
Diffstat (limited to 'drivers/usb/core/message.c')
| -rw-r--r-- | drivers/usb/core/message.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 9bd26dec759..3a2e69ec2f2 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -510,6 +510,10 @@ EXPORT_SYMBOL_GPL(usb_sg_init); * could be transferred. That capability is less useful for low or full * speed interrupt endpoints, which allow at most one packet per millisecond, * of at most 8 or 64 bytes (respectively). + * + * It is not necessary to call this function to reserve bandwidth for devices + * under an xHCI host controller, as the bandwidth is reserved when the + * configuration or interface alt setting is selected. */ void usb_sg_wait(struct usb_sg_request *io) { @@ -1653,6 +1657,21 @@ free_interfaces: if (ret) goto free_interfaces; + /* Make sure we have bandwidth (and available HCD resources) for this + * configuration. Remove endpoints from the schedule if we're dropping + * this configuration to set configuration 0. After this point, the + * host controller will not allow submissions to dropped endpoints. If + * this call fails, the device state is unchanged. + */ + if (cp) + ret = usb_hcd_check_bandwidth(dev, cp, NULL); + else + ret = usb_hcd_check_bandwidth(dev, NULL, NULL); + if (ret < 0) { + usb_autosuspend_device(dev); + goto free_interfaces; + } + /* if it's already configured, clear out old state first. * getting rid of old interfaces means unbinding their drivers. */ @@ -1675,6 +1694,7 @@ free_interfaces: dev->actconfig = cp; if (!cp) { usb_set_device_state(dev, USB_STATE_ADDRESS); + usb_hcd_check_bandwidth(dev, NULL, NULL); usb_autosuspend_device(dev); goto free_interfaces; } |