You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
4.9 KiB
143 lines
4.9 KiB
From 2e2f1ef719a2fa55fd1d95d9536fa8cca94459a4 Mon Sep 17 00:00:00 2001
|
|
From: P33M <P33M@github.com>
|
|
Date: Thu, 18 Jul 2013 17:07:26 +0100
|
|
Subject: [PATCH 082/196] dwc_otg: prevent OOPSes during device disconnects
|
|
|
|
The dwc_otg_urb_enqueue function is thread-unsafe. In particular the
|
|
access of urb->hcpriv, usb_hcd_link_urb_to_ep, dwc_otg_urb->qtd and
|
|
friends does not occur within a critical section and so if a device
|
|
was unplugged during activity there was a high chance that the
|
|
usbcore hub_thread would try to disable the endpoint with partially-
|
|
formed entries in the URB queue. This would result in BUG() or null
|
|
pointer dereferences.
|
|
|
|
Fix so that access of urb->hcpriv, enqueuing to the hardware and
|
|
adding to usbcore endpoint URB lists is contained within a single
|
|
critical section.
|
|
---
|
|
drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 3 ---
|
|
drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 14 +++++---------
|
|
drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c | 6 +-----
|
|
3 files changed, 6 insertions(+), 17 deletions(-)
|
|
|
|
diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
|
|
index af9108c..a1970dc 100644
|
|
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
|
|
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
|
|
@@ -464,7 +464,6 @@ int dwc_otg_hcd_urb_enqueue(dwc_otg_hcd_t * hcd,
|
|
dwc_otg_hcd_urb_t * dwc_otg_urb, void **ep_handle,
|
|
int atomic_alloc)
|
|
{
|
|
- dwc_irqflags_t flags;
|
|
int retval = 0;
|
|
uint8_t needs_scheduling = 0;
|
|
dwc_otg_transaction_type_e tr_type;
|
|
@@ -515,12 +514,10 @@ int dwc_otg_hcd_urb_enqueue(dwc_otg_hcd_t * hcd,
|
|
}
|
|
|
|
if(needs_scheduling) {
|
|
- DWC_SPINLOCK_IRQSAVE(hcd->lock, &flags);
|
|
tr_type = dwc_otg_hcd_select_transactions(hcd);
|
|
if (tr_type != DWC_OTG_TRANSACTION_NONE) {
|
|
dwc_otg_hcd_queue_transactions(hcd, tr_type);
|
|
}
|
|
- DWC_SPINUNLOCK_IRQRESTORE(hcd->lock, flags);
|
|
}
|
|
return retval;
|
|
}
|
|
diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
|
|
index 0f72bd5..ad03ff1 100644
|
|
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
|
|
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
|
|
@@ -679,9 +679,7 @@ static int dwc_otg_urb_enqueue(struct usb_hcd *hcd,
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28)
|
|
struct usb_host_endpoint *ep = urb->ep;
|
|
#endif
|
|
-#if USB_URB_EP_LINKING
|
|
dwc_irqflags_t irqflags;
|
|
-#endif
|
|
void **ref_ep_hcpriv = &ep->hcpriv;
|
|
dwc_otg_hcd_t *dwc_otg_hcd = hcd_to_dwc_otg_hcd(hcd);
|
|
dwc_otg_hcd_urb_t *dwc_otg_urb;
|
|
@@ -733,7 +731,6 @@ static int dwc_otg_urb_enqueue(struct usb_hcd *hcd,
|
|
if(dwc_otg_urb == NULL)
|
|
return -ENOMEM;
|
|
|
|
- urb->hcpriv = dwc_otg_urb;
|
|
if (!dwc_otg_urb && urb->number_of_packets)
|
|
return -ENOMEM;
|
|
|
|
@@ -775,10 +772,10 @@ static int dwc_otg_urb_enqueue(struct usb_hcd *hcd,
|
|
iso_frame_desc[i].length);
|
|
}
|
|
|
|
-#if USB_URB_EP_LINKING
|
|
DWC_SPINLOCK_IRQSAVE(dwc_otg_hcd->lock, &irqflags);
|
|
+ urb->hcpriv = dwc_otg_urb;
|
|
+#if USB_URB_EP_LINKING
|
|
retval = usb_hcd_link_urb_to_ep(hcd, urb);
|
|
- DWC_SPINUNLOCK_IRQRESTORE(dwc_otg_hcd->lock, irqflags);
|
|
if (0 == retval)
|
|
#endif
|
|
{
|
|
@@ -794,17 +791,16 @@ static int dwc_otg_urb_enqueue(struct usb_hcd *hcd,
|
|
urb);
|
|
}
|
|
} else {
|
|
-#if USB_URB_EP_LINKING
|
|
- dwc_irqflags_t irqflags;
|
|
DWC_DEBUGPL(DBG_HCD, "DWC OTG dwc_otg_hcd_urb_enqueue failed rc %d\n", retval);
|
|
- DWC_SPINLOCK_IRQSAVE(dwc_otg_hcd->lock, &irqflags);
|
|
+#if USB_URB_EP_LINKING
|
|
usb_hcd_unlink_urb_from_ep(hcd, urb);
|
|
- DWC_SPINUNLOCK_IRQRESTORE(dwc_otg_hcd->lock, irqflags);
|
|
#endif
|
|
+ urb->hcpriv = NULL;
|
|
if (retval == -DWC_E_NO_DEVICE)
|
|
retval = -ENODEV;
|
|
}
|
|
}
|
|
+ DWC_SPINUNLOCK_IRQRESTORE(dwc_otg_hcd->lock, irqflags);
|
|
return retval;
|
|
}
|
|
|
|
diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
|
|
index 8125307..5aed416 100644
|
|
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
|
|
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_queue.c
|
|
@@ -919,6 +919,7 @@ void dwc_otg_hcd_qtd_init(dwc_otg_qtd_t * qtd, dwc_otg_hcd_urb_t * urb)
|
|
* QH to place the QTD into. If it does not find a QH, then it will create a
|
|
* new QH. If the QH to which the QTD is added is not currently scheduled, it
|
|
* is placed into the proper schedule based on its EP type.
|
|
+ * HCD lock must be held and interrupts must be disabled on entry
|
|
*
|
|
* @param[in] qtd The QTD to add
|
|
* @param[in] hcd The DWC HCD structure
|
|
@@ -931,8 +932,6 @@ int dwc_otg_hcd_qtd_add(dwc_otg_qtd_t * qtd,
|
|
dwc_otg_hcd_t * hcd, dwc_otg_qh_t ** qh, int atomic_alloc)
|
|
{
|
|
int retval = 0;
|
|
- dwc_irqflags_t flags;
|
|
-
|
|
dwc_otg_hcd_urb_t *urb = qtd->urb;
|
|
|
|
/*
|
|
@@ -946,15 +945,12 @@ int dwc_otg_hcd_qtd_add(dwc_otg_qtd_t * qtd,
|
|
goto done;
|
|
}
|
|
}
|
|
- DWC_SPINLOCK_IRQSAVE(hcd->lock, &flags);
|
|
retval = dwc_otg_hcd_qh_add(hcd, *qh);
|
|
if (retval == 0) {
|
|
DWC_CIRCLEQ_INSERT_TAIL(&((*qh)->qtd_list), qtd,
|
|
qtd_list_entry);
|
|
qtd->qh = *qh;
|
|
}
|
|
- DWC_SPINUNLOCK_IRQRESTORE(hcd->lock, flags);
|
|
-
|
|
done:
|
|
|
|
return retval;
|
|
--
|
|
1.9.1
|
|
|
|
|