c06fb25d1f
Some checks failed
Build Kernel / Build all affected Kernels (push) Has been cancelled
Build all core packages / Build all core packages for selected target (push) Has been cancelled
Build and Push prebuilt tools container / Build and Push all prebuilt containers (push) Has been cancelled
Build Toolchains / Build Toolchains for each target (push) Has been cancelled
Build host tools / Build host tools for linux and macos based systems (push) Has been cancelled
Coverity scan build / Coverity x86/64 build (push) Has been cancelled
42 lines
1.6 KiB
Diff
42 lines
1.6 KiB
Diff
From 61129f9de92893aa6f907dfb3971deac46256d03 Mon Sep 17 00:00:00 2001
|
|
From: Jonathan Bell <jonathan@raspberrypi.com>
|
|
Date: Wed, 11 Aug 2021 15:33:57 +0100
|
|
Subject: [PATCH 0162/1085] usb: xhci: workaround for bogus SET_DEQ_PENDING
|
|
endpoint state
|
|
|
|
See https://github.com/raspberrypi/linux/issues/3981
|
|
|
|
An unknown unsafe memory access can result in the ep_state variable
|
|
in xhci_virt_ep being trampled with a stuck SET_DEQ_PENDING state
|
|
despite successful completion of a Set TR Deq Pointer command.
|
|
|
|
All URB enqueue/dequeue calls for the endpoint will fail in this state
|
|
so no transfers are possible until the device is reconnected.
|
|
|
|
As a workaround, clear the flag if we see it set and issue a new Set
|
|
TR Deq command anyway - this should be harmless, as a prior Set TR Deq
|
|
command will only have been issued in the Stopped state, and if the
|
|
endpoint is Running then the controller is required to ignore it and
|
|
respond with a Context State Error event TRB.
|
|
|
|
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
|
|
---
|
|
drivers/usb/host/xhci-ring.c | 6 +++---
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
|
|
|
--- a/drivers/usb/host/xhci-ring.c
|
|
+++ b/drivers/usb/host/xhci-ring.c
|
|
@@ -738,9 +738,9 @@ deq_found:
|
|
}
|
|
|
|
if ((ep->ep_state & SET_DEQ_PENDING)) {
|
|
- xhci_warn(xhci, "Set TR Deq already pending, don't submit for 0x%pad\n",
|
|
- &addr);
|
|
- return -EBUSY;
|
|
+ xhci_warn(xhci, "WARN A Set TR Deq Ptr command is pending for slot %u ep %u\n",
|
|
+ slot_id, ep_index);
|
|
+ ep->ep_state &= ~SET_DEQ_PENDING;
|
|
}
|
|
|
|
/* This function gets called from contexts where it cannot sleep */
|