From 6343e8bf09de16ab4dcae2c6ca1a0e8dbd4dd770 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 9 Oct 2013 17:19:26 +0200 Subject: [PATCH] usb-core: Free bulk streams on interface release Documentation/usb/bulk-streams.txt says: All stream IDs will be deallocated when the driver releases the interface, to ensure that drivers that don't support streams will be able to use the endpoint This commit actually implements this. Signed-off-by: Hans de Goede Signed-off-by: Sarah Sharp --- drivers/usb/core/driver.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 85e0450a2bc7..08283d40616c 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -400,8 +400,9 @@ static int usb_unbind_interface(struct device *dev) { struct usb_driver *driver = to_usb_driver(dev->driver); struct usb_interface *intf = to_usb_interface(dev); + struct usb_host_endpoint *ep, **eps = NULL; struct usb_device *udev; - int error, r, lpm_disable_error; + int i, j, error, r, lpm_disable_error; intf->condition = USB_INTERFACE_UNBINDING; @@ -425,6 +426,26 @@ static int usb_unbind_interface(struct device *dev) driver->disconnect(intf); usb_cancel_queued_reset(intf); + /* Free streams */ + for (i = 0, j = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) { + ep = &intf->cur_altsetting->endpoint[i]; + if (ep->streams == 0) + continue; + if (j == 0) { + eps = kmalloc(USB_MAXENDPOINTS * sizeof(void *), + GFP_KERNEL); + if (!eps) { + dev_warn(dev, "oom, leaking streams\n"); + break; + } + } + eps[j++] = ep; + } + if (j) { + usb_free_streams(intf, eps, j, GFP_KERNEL); + kfree(eps); + } + /* Reset other interface state. * We cannot do a Set-Interface if the device is suspended or * if it is prepared for a system sleep (since installing a new -- 2.39.2