linux-kernel - Re: [PATCH 2/3] usb: gadget: fsl_qe_udc: do not use tasklet_disable before tasklet

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Message-ID: <20121031132650.GP10998@arwen.pp.htv.fi>
Date:	Wed, 31 Oct 2012 15:26:50 +0200
From:	Felipe Balbi <balbi@...com>
To:	Xiaotian Feng <xtfeng@...il.com>
CC:	<linux-kernel@...r.kernel.org>,
	Xiaotian Feng <dannyfeng@...cent.com>,
	Li Yang <leoli@...escale.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 2/3] usb: gadget: fsl_qe_udc: do not use tasklet_disable
 before tasklet_kill

On Wed, Oct 31, 2012 at 04:06:00PM +0800, Xiaotian Feng wrote:
> If tasklet_disable() is called before related tasklet handled,
> tasklet_kill will never be finished. tasklet_kill is enough.

how did you test this ? Why changing FSL driver instead of switching
over to chipidea which is supposed to be shared by every licensee of the
chipidea core ?

> Signed-off-by: Xiaotian Feng <dannyfeng@...cent.com>
> Cc: Li Yang <leoli@...escale.com>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> ---
>  drivers/usb/gadget/fsl_qe_udc.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
> index b09452d..4ad3b82 100644
> --- a/drivers/usb/gadget/fsl_qe_udc.c
> +++ b/drivers/usb/gadget/fsl_qe_udc.c
> @@ -2661,7 +2661,7 @@ static int __devexit qe_udc_remove(struct platform_device *ofdev)
>  	usb_del_gadget_udc(&udc->gadget);
>  
>  	udc->done = &done;
> -	tasklet_disable(&udc->rx_tasklet);
> +	tasklet_kill(&udc->rx_tasklet);
>  
>  	if (udc->nullmap) {
>  		dma_unmap_single(udc->gadget.dev.parent,
> @@ -2698,8 +2698,6 @@ static int __devexit qe_udc_remove(struct platform_device *ofdev)
>  	free_irq(udc->usb_irq, udc);
>  	irq_dispose_mapping(udc->usb_irq);
>  
> -	tasklet_kill(&udc->rx_tasklet);
> -
>  	iounmap(udc->usb_regs);
>  
>  	device_unregister(&udc->gadget.dev);
> -- 
> 1.7.9.5
> 

-- 
balbi

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