linux-kernel - Re: [RESEND/PATCH 5/6] USB: musb-gadget: complete request only if data is transfered over

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Message-ID: <4C8E18AD.8000502@ru.mvista.com>
Date:	Mon, 13 Sep 2010 16:27:25 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	tom.leiming@...il.com
CC:	greg@...ah.com, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Felipe Balbi <balbi@...com>, Anand Gadiyar <gadiyar@...com>,
	Mike Frysinger <vapier@...too.org>
Subject: Re: [RESEND/PATCH 5/6] USB: musb-gadget: complete request only if
 data is transfered over

Hello.

tom.leiming@...il.com wrote:

> From: Ming Lei <tom.leiming@...il.com>

> Complete the current request only if the data transfer is over.

> Signed-off-by: Ming Lei <tom.leiming@...il.com>
> Cc: David Brownell <dbrownell@...rs.sourceforge.net>
> Cc: Felipe Balbi <me@...ipebalbi.com>
> Cc: Anand Gadiyar <gadiyar@...com>
> Cc: Mike Frysinger <vapier@...too.org>
> Cc: Sergei Shtylyov <sshtylyov@...mvista.com>
> ---
>  drivers/usb/musb/musb_gadget.c |   16 ++++++++--------
>  1 files changed, 8 insertions(+), 8 deletions(-)

> diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> index f3ee04f..fa826f9 100644
> --- a/drivers/usb/musb/musb_gadget.c
> +++ b/drivers/usb/musb/musb_gadget.c
> @@ -501,14 +501,14 @@ void musb_g_tx(struct musb *musb, u8 epnum)
>  				request->zero = 0;
>  			}
>  
> -			/* ... or if not, then complete it. */
> -			musb_g_giveback(musb_ep, request, 0);
> -
> -			request = musb_ep->desc ? next_request(musb_ep) : NULL;
> -			if (!request) {
> -				DBG(4, "%s idle now\n",
> -					musb_ep->end_point.name);
> -				return;
> +			if (request->actual == request->length) {

    But why not modify the conditional above all that code, just excluding 
'is_dma' from it. This conditional already includes (request->actual == 
request->length) check. Please recast this patch.

> +				musb_g_giveback(musb_ep, request, 0);
> +				request = musb_ep->desc ? next_request(musb_ep) : NULL;
> +				if (!request) {
> +					DBG(4, "%s idle now\n",
> +						musb_ep->end_point.name);
> +					return;
> +				}
>  			}
>  		}
>  

WBR, Sergei
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