From: John Ogness <[email protected]> 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.
Cc: Johan Hovold <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Signed-off-by: John Ogness <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> --- drivers/usb/serial/sierra.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c index 55956a638f5b..a43263a0edd8 100644 --- a/drivers/usb/serial/sierra.c +++ b/drivers/usb/serial/sierra.c @@ -409,6 +409,7 @@ static void sierra_outdat_callback(struct urb *urb) struct sierra_port_private *portdata = usb_get_serial_port_data(port); struct sierra_intf_private *intfdata; int status = urb->status; + unsigned long flags; intfdata = usb_get_serial_data(port->serial); @@ -419,12 +420,12 @@ static void sierra_outdat_callback(struct urb *urb) dev_dbg(&port->dev, "%s - nonzero write bulk status " "received: %d\n", __func__, status); - spin_lock(&portdata->lock); + spin_lock_irqsave(&portdata->lock, flags); --portdata->outstanding_urbs; - spin_unlock(&portdata->lock); - spin_lock(&intfdata->susp_lock); + spin_unlock_irqrestore(&portdata->lock, flags); + spin_lock_irqsave(&intfdata->susp_lock, flags); --intfdata->in_flight; - spin_unlock(&intfdata->susp_lock); + spin_unlock_irqrestore(&intfdata->susp_lock, flags); usb_serial_port_softint(port); } -- 2.18.0 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
