Commit 7f675111 authored by Alan Stern's avatar Alan Stern Committed by Ben Hutchings

USB: xhci: fix lock-inversion problem

commit 63aea0db upstream.

With threaded interrupts, bottom-half handlers are called with
interrupts enabled.  Therefore they can't safely use spin_lock(); they
have to use spin_lock_irqsave().  Lockdep warns about a violation
occurring in xhci_irq():

=========================================================
[ INFO: possible irq lock inversion dependency detected ]
4.11.0-rc8-dbg+ #1 Not tainted
---------------------------------------------------------
swapper/7/0 just changed the state of lock:
 (&(&ehci->lock)->rlock){-.-...}, at: [<ffffffffa0130a69>]
ehci_hrtimer_func+0x29/0xc0 [ehci_hcd]
but this lock took another, HARDIRQ-unsafe lock in the past:
 (hcd_urb_list_lock){+.....}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(hcd_urb_list_lock);
                               local_irq_disable();
                               lock(&(&ehci->lock)->rlock);
                               lock(hcd_urb_list_lock);
  <Interrupt>
    lock(&(&ehci->lock)->rlock);
 *** DEADLOCK ***

no locks held by swapper/7/0.
the shortest dependencies between 2nd lock and 1st lock:
 -> (hcd_urb_list_lock){+.....} ops: 252 {
    HARDIRQ-ON-W at:
                      __lock_acquire+0x602/0x1280
                      lock_acquire+0xd5/0x1c0
                      _raw_spin_lock+0x2f/0x40
                      usb_hcd_unlink_urb_from_ep+0x1b/0x60 [usbcore]
                      xhci_giveback_urb_in_irq.isra.45+0x70/0x1b0 [xhci_hcd]
                      finish_td.constprop.60+0x1d8/0x2e0 [xhci_hcd]
                      xhci_irq+0xdd6/0x1fa0 [xhci_hcd]
                      usb_hcd_irq+0x26/0x40 [usbcore]
                      irq_forced_thread_fn+0x2f/0x70
                      irq_thread+0x149/0x1d0
                      kthread+0x113/0x150
                      ret_from_fork+0x2e/0x40

This patch fixes the problem.
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 1c2bfccf
......@@ -2645,11 +2645,12 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
union xhci_trb *trb;
union xhci_trb *event_ring_deq;
irqreturn_t ret = IRQ_NONE;
unsigned long flags;
dma_addr_t deq;
u64 temp_64;
u32 status;
spin_lock(&xhci->lock);
spin_lock_irqsave(&xhci->lock, flags);
trb = xhci->event_ring->dequeue;
/* Check if the xHC generated the interrupt, or the irq is shared */
status = xhci_readl(xhci, &xhci->op_regs->status);
......@@ -2724,7 +2725,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
ret = IRQ_HANDLED;
out:
spin_unlock(&xhci->lock);
spin_unlock_irqrestore(&xhci->lock, flags);
return ret;
}
......
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