On Sun, 21 Oct 2012, Artem S. Tashkinov wrote: > dmesg messages up to a crash can be seen here: https://bugzilla.kernel.org/attachment.cgi?id=84221 The first problem in the log is endpoint list corruption. Here's a debugging patch which should provide a little more information. Alan Stern drivers/usb/core/hcd.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) Index: usb-3.6/drivers/usb/core/hcd.c =================================================================== --- usb-3.6.orig/drivers/usb/core/hcd.c +++ usb-3.6/drivers/usb/core/hcd.c @@ -1083,6 +1083,8 @@ EXPORT_SYMBOL_GPL(usb_calc_bus_time); /*-------------------------------------------------------------------------*/ +static bool list_error; + /** * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue * @hcd: host controller to which @urb was submitted @@ -1126,6 +1128,20 @@ int usb_hcd_link_urb_to_ep(struct usb_hc */ if (HCD_RH_RUNNING(hcd)) { urb->unlinked = 0; + + { + struct list_head *cur = &urb->ep->urb_list; + struct list_head *prev = cur->prev; + + if (prev->next != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list add corruption: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, prev, prev->next); + } + } + list_add_tail(&urb->urb_list, &urb->ep->urb_list); } else { rc = -ESHUTDOWN; @@ -1193,6 +1209,26 @@ void usb_hcd_unlink_urb_from_ep(struct u { /* clear all state linking urb to this dev (and hcd) */ spin_lock(&hcd_urb_list_lock); + { + struct list_head *cur = &urb->urb_list; + struct list_head *prev = cur->prev; + struct list_head *next = cur->next; + + if (prev->next != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list del corruption prev: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, prev, prev->next); + } + if (next->prev != cur && !list_error) { + list_error = true; + dev_err(&urb->dev->dev, + "ep %x list del corruption next: %p %p %p\n", + urb->ep->desc.bEndpointAddress, + cur, next, next->prev); + } + } list_del_init(&urb->urb_list); spin_unlock(&hcd_urb_list_lock); } -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
