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usb: hub: Fix usb enumeration issue due to address0 race
commit6ae6dc22d2
upstream. xHC hardware can only have one slot in default state with address 0 waiting for a unique address at a time, otherwise "undefined behavior may occur" according to xhci spec 5.4.3.4 The address0_mutex exists to prevent this across both xhci roothubs. If hub_port_init() fails, it may unlock the mutex and exit with a xhci slot in default state. If the other xhci roothub calls hub_port_init() at this point we end up with two slots in default state. Make sure the address0_mutex protects the slot default state across hub_port_init() retries, until slot is addressed or disabled. Note, one known minor case is not fixed by this patch. If device needs to be reset during resume, but fails all hub_port_init() retries in usb_reset_and_verify_device(), then it's possible the slot is still left in default state when address0_mutex is unlocked. Cc: <stable@vger.kernel.org> Fixes:638139eb95
("usb: hub: allow to process more usb hub events in parallel") Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20211115221630.871204-1-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
00f1038c72
commit
5bf3a0c778
1 changed files with 11 additions and 3 deletions
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@ -4628,8 +4628,6 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
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if (oldspeed == USB_SPEED_LOW)
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delay = HUB_LONG_RESET_TIME;
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mutex_lock(hcd->address0_mutex);
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/* Reset the device; full speed may morph to high speed */
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/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
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retval = hub_port_reset(hub, port1, udev, delay, false);
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@ -4940,7 +4938,6 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
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hub_port_disable(hub, port1, 0);
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update_devnum(udev, devnum); /* for disconnect processing */
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}
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mutex_unlock(hcd->address0_mutex);
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return retval;
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}
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@ -5170,6 +5167,9 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
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unit_load = 100;
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status = 0;
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mutex_lock(hcd->address0_mutex);
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for (i = 0; i < PORT_INIT_TRIES; i++) {
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/* reallocate for each attempt, since references
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@ -5206,6 +5206,8 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
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if (status < 0)
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goto loop;
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mutex_unlock(hcd->address0_mutex);
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if (udev->quirks & USB_QUIRK_DELAY_INIT)
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msleep(2000);
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@ -5294,6 +5296,7 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
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loop_disable:
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hub_port_disable(hub, port1, 1);
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mutex_lock(hcd->address0_mutex);
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loop:
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usb_ep0_reinit(udev);
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release_devnum(udev);
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@ -5320,6 +5323,8 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
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}
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done:
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mutex_unlock(hcd->address0_mutex);
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hub_port_disable(hub, port1, 1);
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if (hcd->driver->relinquish_port && !hub->hdev->parent) {
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if (status != -ENOTCONN && status != -ENODEV)
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@ -5839,6 +5844,8 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
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bos = udev->bos;
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udev->bos = NULL;
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mutex_lock(hcd->address0_mutex);
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for (i = 0; i < PORT_INIT_TRIES; ++i) {
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/* ep0 maxpacket size may change; let the HCD know about it.
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@ -5848,6 +5855,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
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if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
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break;
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}
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mutex_unlock(hcd->address0_mutex);
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if (ret < 0)
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goto re_enumerate;
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