linux-kernel - Re: [PATCH] USB: XHCI: xhci-ring: Remove unused dma address calculation in inc_enq and inc

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Date:	Wed, 5 Sep 2012 15:47:23 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Girish Verma <girish@...cuitsutra.com>
Cc:	kernel-janitors@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH] USB: XHCI: xhci-ring: Remove unused dma address
 calculation in inc_enq and inc_deq function

Hi Girish,

Sorry for taking a really long time to respond!  This is a good idea,
but your patch doesn't apply any more.  Can you update it against the
latest kernel and resend it?

Sarah Sharp

On Sun, May 13, 2012 at 08:59:02PM +0530, Girish Verma wrote:
> In xhci-ring.c, function inc_enq and inc_deq calculate the dma address
> of trb but never used. 
> 
> Signed-off-by: Girish Verma <girish@...cuitsutra.com>
> ---
>  drivers/usb/host/xhci-ring.c |    4 ----
>  1 files changed, 0 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> index 3d9422f..dcd67c1 100644
> --- a/drivers/usb/host/xhci-ring.c
> +++ b/drivers/usb/host/xhci-ring.c
> @@ -146,7 +146,6 @@ static void next_trb(struct xhci_hcd *xhci,
>  static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring)
>  {
>  	union xhci_trb *next;
> -	unsigned long long addr;
>  
>  	ring->deq_updates++;
>  
> @@ -168,7 +167,6 @@ static void inc_deq(struct xhci_hcd *xhci, struct xhci_ring *ring)
>  		ring->dequeue = ring->deq_seg->trbs;
>  		next = ring->dequeue;
>  	}
> -	addr = (unsigned long long) xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
>  }
>  
>  /*
> @@ -193,7 +191,6 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
>  {
>  	u32 chain;
>  	union xhci_trb *next;
> -	unsigned long long addr;
>  
>  	chain = le32_to_cpu(ring->enqueue->generic.field[3]) & TRB_CHAIN;
>  	/* If this is not event ring, there is one less usable TRB */
> @@ -245,7 +242,6 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
>  		ring->enqueue = ring->enq_seg->trbs;
>  		next = ring->enqueue;
>  	}
> -	addr = (unsigned long long) xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
>  }
>  
>  /*
> -- 
> 
> 
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