ChangeSet 1.1123.18.18, 2003/08/13 15:15:48-07:00, kevino@asti-usa.com

[PATCH] USB: bug in EHCI device reset through transaction

This supports another special case:  devices can revert to the "default"
(address zero) state temporarily in usb_reset_device().

This is the quick fix; 2.6 could get rid of these special cases in ep0
hcd logic by disabling ep0, but 2.4 can't.


 drivers/usb/host/ehci-q.c |    4 ++++
 1 files changed, 4 insertions(+)


diff -Nru a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
--- a/drivers/usb/host/ehci-q.c	Fri Aug 15 10:44:56 2003
+++ b/drivers/usb/host/ehci-q.c	Fri Aug 15 10:44:56 2003
@@ -794,6 +794,10 @@
 					qh->hw_info1 = cpu_to_le32 (info);
 				}
 			}
+
+                        /* usb_reset_device() briefly reverts to address 0 */
+                        if (usb_pipedevice (urb->pipe) == 0)
+                                qh->hw_info1 &= cpu_to_le32(~0x7f);
 		}
 
 		/* usb_clear_halt() means qh data toggle gets reset */