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usb: wusbcore: remove excessive irqsave 

wa_urb_dequeue() locks multiple spinlocks while disabling interrupts:

   spin_lock_irqsave(&lock1, flags);
   spin_lock_irqsave(&lock2, flags2);

Obviously there is no need for the second irqsave and "flags2" variable
since interrupts are disabled at that point. Remove the second irqsave:

   spin_lock_irqsave(&lock1, flags);
   spin_lock(&lock2);

and eliminate the flags2 variable.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Ogness 2018-06-25 00:08:41 +02:00 committed by Greg Kroah-Hartman
parent 8982c8440f
commit 7375fc9f5f
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/wusbcore/wa-xfer.c
View File

@ -1918,7 +1918,7 @@ EXPORT_SYMBOL_GPL(wa_urb_enqueue);
*/
int wa_urb_dequeue(struct wahc *wa, struct urb *urb, int status)
{
unsigned long flags, flags2;
unsigned long flags;
struct wa_xfer *xfer;
struct wa_seg *seg;
struct wa_rpipe *rpipe;
@ -1964,10 +1964,10 @@ int wa_urb_dequeue(struct wahc *wa, struct urb *urb, int status)
goto out_unlock;
}
/* Check the delayed list -> if there, release and complete */
spin_lock_irqsave(&wa->xfer_list_lock, flags2);
spin_lock(&wa->xfer_list_lock);
if (!list_empty(&xfer->list_node) && xfer->seg == NULL)
goto dequeue_delayed;
spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
spin_unlock(&wa->xfer_list_lock);
if (xfer->seg == NULL) /* still hasn't reached */
goto out_unlock; /* setup(), enqueue_b() completes */
/* Ok, the xfer is in flight already, it's been setup and submitted.*/
@ -2054,7 +2054,7 @@ out_unlock:
dequeue_delayed:
list_del_init(&xfer->list_node);
spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
spin_unlock(&wa->xfer_list_lock);
xfer->result = urb->status;
spin_unlock_irqrestore(&xfer->lock, flags);
wa_xfer_giveback(xfer);