linux-kernel - Re: [PATCH] usb: dwc3: remove unused @lock member of dwc3

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Date:   Thu, 20 Jun 2019 11:19:16 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] usb: dwc3: remove unused @lock member of dwc3_ep struct


Hi,

Chunfeng Yun <chunfeng.yun@...iatek.com> writes:

> The member @lock of dwc2_ep struct is only initialized,
> and not used elsewhere, so remove it.
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
>  drivers/usb/dwc3/core.h   | 2 --
>  drivers/usb/dwc3/gadget.c | 2 --
>  2 files changed, 4 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index f19cbeb01087..72d28cb14bdf 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -649,7 +649,6 @@ struct dwc3_event_buffer {
>   * @cancelled_list: list of cancelled requests for this endpoint
>   * @pending_list: list of pending requests for this endpoint
>   * @started_list: list of started requests on this endpoint
> - * @lock: spinlock for endpoint request queue traversal
>   * @regs: pointer to first endpoint register
>   * @trb_pool: array of transaction buffers
>   * @trb_pool_dma: dma address of @trb_pool
> @@ -677,7 +676,6 @@ struct dwc3_ep {
>  	struct list_head	pending_list;
>  	struct list_head	started_list;
>  
> -	spinlock_t		lock;
>  	void __iomem		*regs;
>  
>  	struct dwc3_trb		*trb_pool;
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index d67655384eb2..7f75da30caba 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2251,8 +2251,6 @@ static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
>  		dep->endpoint.comp_desc = NULL;
>  	}
>  
> -	spin_lock_init(&dep->lock);

heh, thanks. This is left-over from when I playing with further
paralelizing the driver. Turned out that there are not enough gains to
justify that work. I'll apply this patch.

-- 
balbi