From 3f38dace1a206d0ffe9d9a25e97288fbf8c79b55 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Mon, 25 Jun 2018 00:08:37 +0200 Subject: [PATCH] usb: usbfs: use irqsave() in USB's complete callback The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives. Signed-off-by: Sebastian Andrzej Siewior Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devio.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 476dcc5..6ce77b3 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -585,9 +585,10 @@ static void async_completed(struct urb *urb) struct siginfo sinfo; struct pid *pid = NULL; const struct cred *cred = NULL; + unsigned long flags; int signr; - spin_lock(&ps->lock); + spin_lock_irqsave(&ps->lock, flags); list_move_tail(&as->asynclist, &ps->async_completed); as->status = urb->status; signr = as->signr; @@ -611,7 +612,7 @@ static void async_completed(struct urb *urb) cancel_bulk_urbs(ps, as->bulk_addr); wake_up(&ps->wait); - spin_unlock(&ps->lock); + spin_unlock_irqrestore(&ps->lock, flags); if (signr) { kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred); -- 2.7.4