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USB: serial: mos7720: 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: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
John Ogness 2018-06-24 00:32:08 +02:00 committed by Johan Hovold
parent 6778b0cbdb
commit f7c8a9ccc9
1 changed files with 3 additions and 2 deletions
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5
drivers/usb/serial/mos7720.c
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@ -340,14 +340,15 @@ static void async_complete(struct urb *urb)
{
struct urbtracker *urbtrack = urb->context;
int status = urb->status;
unsigned long flags;
if (unlikely(status))
dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
/* remove the urbtracker from the active_urbs list */
spin_lock(&urbtrack->mos_parport->listlock);
spin_lock_irqsave(&urbtrack->mos_parport->listlock, flags);
list_del(&urbtrack->urblist_entry);
spin_unlock(&urbtrack->mos_parport->listlock);
spin_unlock_irqrestore(&urbtrack->mos_parport->listlock, flags);
kref_put(&urbtrack->ref_count, destroy_urbtracker);
}