This is a note to let you know that I've just added the patch titled
xhci: init command timeout timer earlier to avoid deleting it uninitialized
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:
xhci-init-command-timeout-timer-earlier-to-avoid-deleting-it-uninitialized.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 cc8e4fc0c3b5e8340bc8358990515d116a3c274c Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Mon, 21 Sep 2015 17:46:17 +0300
Subject: xhci: init command timeout timer earlier to avoid deleting it uninitialized
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit cc8e4fc0c3b5e8340bc8358990515d116a3c274c upstream.
Don't check if timer is running with a timer_pending() before
deleting it with del_timer_sync(), this defies the whole point of
the sync part and can cause a possible race.
Instead we just want to make sure the timer is initialized early enough
before we have a chance to delete it.
Reported-by: Oliver Neukum <oneukum@xxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-mem.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1792,8 +1792,7 @@ void xhci_mem_cleanup(struct xhci_hcd *x
int size;
int i, j, num_ports;
- if (timer_pending(&xhci->cmd_timer))
- del_timer_sync(&xhci->cmd_timer);
+ del_timer_sync(&xhci->cmd_timer);
/* Free the Event Ring Segment Table and the actual Event Ring */
size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries);
@@ -2321,6 +2320,10 @@ int xhci_mem_init(struct xhci_hcd *xhci,
INIT_LIST_HEAD(&xhci->cmd_list);
+ /* init command timeout timer */
+ setup_timer(&xhci->cmd_timer, xhci_handle_command_timeout,
+ (unsigned long)xhci);
+
page_size = readl(&xhci->op_regs->page_size);
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
"Supported page size register = 0x%x", page_size);
@@ -2505,10 +2508,6 @@ int xhci_mem_init(struct xhci_hcd *xhci,
"Wrote ERST address to ir_set 0.");
xhci_print_ir_set(xhci, 0);
- /* init command timeout timer */
- setup_timer(&xhci->cmd_timer, xhci_handle_command_timeout,
- (unsigned long)xhci);
-
/*
* XXX: Might need to set the Interrupter Moderation Register to
* something other than the default (~1ms minimum between interrupts).
Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are
queue-4.2/usb-xhci-exit-early-in-xhci_setup_device-if-we-re-halted-or-dying.patch
queue-4.2/xhci-give-command-abortion-one-more-chance-before-killing-xhci.patch
queue-4.2/usb-xhci-clear-xhci_state_dying-on-start.patch
queue-4.2/xhci-move-xhci_pme_quirk-behind-ifdef-config_pm.patch
queue-4.2/usb-xhci-add-support-for-urb_zero_packet-to-bulk-sg-transfers.patch
queue-4.2/usb-xhci-stop-everything-on-the-first-call-to-xhci_stop.patch
queue-4.2/xhci-init-command-timeout-timer-earlier-to-avoid-deleting-it-uninitialized.patch
queue-4.2/usb-xhci-lock-mutex-on-xhci_stop.patch
queue-4.2/xhci-change-xhci-1.0-only-restrictions-to-support-xhci-1.1.patch
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