This is a note to let you know that I've just added the patch titled
usb: xhci: lock mutex on xhci_stop
to the 4.2-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:
usb-xhci-lock-mutex-on-xhci_stop.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85ac90f8953a58f6a057b727bc9db97721e3fb8e Mon Sep 17 00:00:00 2001
From: Roger Quadros <rogerq@xxxxxx>
Date: Mon, 21 Sep 2015 17:46:12 +0300
Subject: usb: xhci: lock mutex on xhci_stop
From: Roger Quadros <rogerq@xxxxxx>
commit 85ac90f8953a58f6a057b727bc9db97721e3fb8e upstream.
Else it races with xhci_setup_device
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -677,8 +677,11 @@ void xhci_stop(struct usb_hcd *hcd)
u32 temp;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ mutex_lock(&xhci->mutex);
+
if (!usb_hcd_is_primary_hcd(hcd)) {
xhci_only_stop_hcd(xhci->shared_hcd);
+ mutex_unlock(&xhci->mutex);
return;
}
@@ -717,6 +720,7 @@ void xhci_stop(struct usb_hcd *hcd)
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
"xhci_stop completed - status = %x",
readl(&xhci->op_regs->status));
+ mutex_unlock(&xhci->mutex);
}
/*
Patches currently in stable-queue which might be from rogerq@xxxxxx are
queue-4.2/usb-xhci-exit-early-in-xhci_setup_device-if-we-re-halted-or-dying.patch
queue-4.2/usb-xhci-clear-xhci_state_dying-on-start.patch
queue-4.2/usb-xhci-stop-everything-on-the-first-call-to-xhci_stop.patch
queue-4.2/usb-xhci-lock-mutex-on-xhci_stop.patch
--
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