diff mbox

[08/12] usb: wusbcore: remove excessive irqsave

Message ID 20180624220845.6726-9-bigeasy@linutronix.de (mailing list archive)
State New, archived
Headers show

Commit Message

Sebastian Andrzej Siewior June 24, 2018, 10:08 p.m. UTC 
From: John Ogness <john.ogness@linutronix.de>

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.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/usb/wusbcore/wa-xfer.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/usb/wusbcore/wa-xfer.c b/drivers/usb/wusbcore/wa-xfer.c
index 7fca4e7e556d..01f2f21830c0 100644
--- a/drivers/usb/wusbcore/wa-xfer.c
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -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 @@  int wa_urb_dequeue(struct wahc *wa, struct urb *urb, int status)
 
 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);