This is a note to let you know that I've just added the patch titled
xhci: fix oops when xhci resumes from hibernate with hw lpm capable devices
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-fix-oops-when-xhci-resumes-from-hibernate-with-hw-lpm-capable-devices.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 96044694b8511bc2b04df0776b4ba295cfe005c0 Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Thu, 11 Sep 2014 13:55:50 +0300
Subject: xhci: fix oops when xhci resumes from hibernate with hw lpm capable devices
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit 96044694b8511bc2b04df0776b4ba295cfe005c0 upstream.
Resuming from hibernate (S4) will restart and re-initialize xHC.
The device contexts are freed and will be re-allocated later during device reset.
Usb core will disable link pm in device resume before device reset, which will
try to change the max exit latency, accessing the device contexts before they are re-allocated.
There is no need to zero (disable) the max exit latency when disabling hw lpm
for a freshly re-initialized xHC. So check that device context exists before
doing anything. The max exit latency will be set again after device reset when usb core
enables the link pm.
Reported-by: Imre Deak <imre.deak@xxxxxxxxx>
Tested-by: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3928,13 +3928,21 @@ static int __maybe_unused xhci_change_ma
int ret;
spin_lock_irqsave(&xhci->lock, flags);
- if (max_exit_latency == xhci->devs[udev->slot_id]->current_mel) {
+
+ virt_dev = xhci->devs[udev->slot_id];
+
+ /*
+ * virt_dev might not exists yet if xHC resumed from hibernate (S4) and
+ * xHC was re-initialized. Exit latency will be set later after
+ * hub_port_finish_reset() is done and xhci->devs[] are re-allocated
+ */
+
+ if (!virt_dev || max_exit_latency == virt_dev->current_mel) {
spin_unlock_irqrestore(&xhci->lock, flags);
return 0;
}
/* Attempt to issue an Evaluate Context command to change the MEL. */
- virt_dev = xhci->devs[udev->slot_id];
command = xhci->lpm_command;
ctrl_ctx = xhci_get_input_control_ctx(xhci, command->in_ctx);
if (!ctrl_ctx) {
Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are
queue-3.14/usb-host-xhci-fix-compliance-mode-workaround.patch
queue-3.14/xhci-fix-null-pointer-dereference-if-xhci-initialization-fails.patch
queue-3.14/xhci-fix-oops-when-xhci-resumes-from-hibernate-with-hw-lpm-capable-devices.patch
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