diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/core/hcd.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 9b445f43f825..9c4e2922b04d 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -2049,7 +2049,7 @@ int usb_alloc_streams(struct usb_interface *interface, { struct usb_hcd *hcd; struct usb_device *dev; - int i; + int i, ret; dev = interface_to_usbdev(interface); hcd = bus_to_hcd(dev->bus); @@ -2058,13 +2058,24 @@ int usb_alloc_streams(struct usb_interface *interface, if (dev->speed != USB_SPEED_SUPER) return -EINVAL; - /* Streams only apply to bulk endpoints. */ - for (i = 0; i < num_eps; i++) + for (i = 0; i < num_eps; i++) { + /* Streams only apply to bulk endpoints. */ if (!usb_endpoint_xfer_bulk(&eps[i]->desc)) return -EINVAL; + /* Re-alloc is not allowed */ + if (eps[i]->streams) + return -EINVAL; + } - return hcd->driver->alloc_streams(hcd, dev, eps, num_eps, + ret = hcd->driver->alloc_streams(hcd, dev, eps, num_eps, num_streams, mem_flags); + if (ret < 0) + return ret; + + for (i = 0; i < num_eps; i++) + eps[i]->streams = ret; + + return ret; } EXPORT_SYMBOL_GPL(usb_alloc_streams); @@ -2086,19 +2097,26 @@ int usb_free_streams(struct usb_interface *interface, { struct usb_hcd *hcd; struct usb_device *dev; - int i; + int i, ret; dev = interface_to_usbdev(interface); hcd = bus_to_hcd(dev->bus); if (dev->speed != USB_SPEED_SUPER) return -EINVAL; - /* Streams only apply to bulk endpoints. */ + /* Double-free is not allowed */ for (i = 0; i < num_eps; i++) - if (!eps[i] || !usb_endpoint_xfer_bulk(&eps[i]->desc)) + if (!eps[i] || !eps[i]->streams) return -EINVAL; - return hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags); + ret = hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags); + if (ret < 0) + return ret; + + for (i = 0; i < num_eps; i++) + eps[i]->streams = 0; + + return ret; } EXPORT_SYMBOL_GPL(usb_free_streams); |