[RFC v2 09/11] USB: Prepare for refactoring by adding extra udev checks.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The next patch will refactor the hub port code to rip out the recursive
call to hub_port_reset on a failed hot reset.  In preparation for that,
make sure all code paths can deal with being called with a NULL udev.
The usb_device will not be valid if warm reset was issued because a port
transitioned to the Inactive or Compliance Mode on a device connect.

This patch should have no effect on current behavior.

Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
---
 drivers/usb/core/hub.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c8d32b4..d8de712 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2588,6 +2588,9 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1,
 			 */
 			if (!(portstatus & USB_PORT_STAT_RESET) &&
 			    (portstatus & USB_PORT_STAT_ENABLE)) {
+				if (!udev)
+					return 0;
+
 				if (hub_is_wusb(hub))
 					udev->speed = USB_SPEED_WIRELESS;
 				else if (hub_is_superspeed(hub->hdev))
@@ -2634,13 +2637,15 @@ static void hub_port_finish_reset(struct usb_hub *hub, int port1,
 			struct usb_hcd *hcd;
 			/* TRSTRCY = 10 ms; plus some extra */
 			msleep(10 + 40);
-			update_devnum(udev, 0);
-			hcd = bus_to_hcd(udev->bus);
-			/* The xHC may think the device is already reset,
-			 * so ignore the status.
-			 */
-			if (hcd->driver->reset_device)
-				hcd->driver->reset_device(hcd, udev);
+			if (udev) {
+				update_devnum(udev, 0);
+				hcd = bus_to_hcd(udev->bus);
+				/* The xHC may think the device is already
+				 * reset, so ignore the status.
+				 */
+				if (hcd->driver->reset_device)
+					hcd->driver->reset_device(hcd, udev);
+			}
 		}
 		/* FALL THROUGH */
 	case -ENOTCONN:
@@ -2654,7 +2659,7 @@ static void hub_port_finish_reset(struct usb_hub *hub, int port1,
 			clear_port_feature(hub->hdev, port1,
 					USB_PORT_FEAT_C_PORT_LINK_STATE);
 		}
-		if (!warm)
+		if (!warm && udev)
 			usb_set_device_state(udev, *status
 					? USB_STATE_NOTATTACHED
 					: USB_STATE_DEFAULT);
-- 
1.7.9

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux