Force-threaded interrupt handlers used to run with interrupts enabled,
something which could lead to deadlocks in case a threaded handler
shared a lock with code running in hard interrupt context (e.g. timer
callbacks) and did not explicitly disable interrupts.
Since commit 81e2073c175b ("genirq: Disable interrupts for force
threaded handlers") interrupt handlers always run with interrupts
disabled on non-RT so that drivers no longer need to do handle forced
threading ("threadirqs").
Drop the now obsolete workaround added by commit 63aea0dbab90 ("USB:
xhci: fix lock-inversion problem").
Cc: Alan Stern <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
---
drivers/usb/host/xhci-ring.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index ce38076901e2..20f5ded29b3b 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3015,12 +3015,11 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
union xhci_trb *event_ring_deq;
irqreturn_t ret = IRQ_NONE;
- unsigned long flags;
u64 temp_64;
u32 status;
int event_loop = 0;
- spin_lock_irqsave(&xhci->lock, flags);
+ spin_lock(&xhci->lock);
/* Check if the xHC generated the interrupt, or the irq is shared */
status = readl(&xhci->op_regs->status);
if (status == ~(u32)0) {
@@ -3083,7 +3082,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
ret = IRQ_HANDLED;
out:
- spin_unlock_irqrestore(&xhci->lock, flags);
+ spin_unlock(&xhci->lock);
return ret;
}
--
2.26.3
