USB: core: Tolerate protocol stall during hub and port status read

commit 3824c1ddaf744be44b170a335332b9d6afe79254 upstream.

Protocol stall should not be fatal while reading port or hub status as it is
transient state.  Currently hub EP0 STALL during port status read results in
failed device enumeration.  This has been observed with ST-Ericsson (formerly
Philips) USB 2.0 Hub (04cc:1521) after connecting keyboard.

Signed-off-by: Libor Pechacek <lpechacek@suse.cz>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index e5363dee9ba03807b97af0d7c1a747bd72711c4f..642fc7e30a29c0b7a2d5bd48394a56d7637f87ff 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -327,7 +327,8 @@ static int get_hub_status(struct usb_device *hdev,
 {
        int i, status = -ETIMEDOUT;
 
-       for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
+       for (i = 0; i < USB_STS_RETRIES &&
+                       (status == -ETIMEDOUT || status == -EPIPE); i++) {
                status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
                        USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
                        data, sizeof(*data), USB_STS_TIMEOUT);
@@ -343,7 +344,8 @@ static int get_port_status(struct usb_device *hdev, int port1,
 {
        int i, status = -ETIMEDOUT;
 
-       for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
+       for (i = 0; i < USB_STS_RETRIES &&
+                       (status == -ETIMEDOUT || status == -EPIPE); i++) {
                status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
                        USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
                        data, sizeof(*data), USB_STS_TIMEOUT);