linux-kernel - Re: [PATCH] usb: gadget: udc: lpc32xx: allocate descriptor with GFP

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Date:   Tue, 18 Jun 2019 10:33:41 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sylvain Lemieux <slemieux.tyco@...il.com>,
        James Grant <james.grant@....com>, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC

Alexandre Belloni <alexandre.belloni@...tlin.com> writes:

> Gadget drivers may queue request in interrupt context. This would lead to
> a descriptor allocation in that context. In that case we would hit
> BUG_ON(in_interrupt()) in __get_vm_area_node.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
>  drivers/usb/gadget/udc/lpc32xx_udc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c
> index d8f1c60793ed..b706d9c85a35 100644
> --- a/drivers/usb/gadget/udc/lpc32xx_udc.c
> +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c
> @@ -938,7 +938,7 @@ static struct lpc32xx_usbd_dd_gad *udc_dd_alloc(struct lpc32xx_udc *udc)
>  	struct lpc32xx_usbd_dd_gad	*dd;
>  
>  	dd = (struct lpc32xx_usbd_dd_gad *) dma_pool_alloc(
> -			udc->dd_cache, (GFP_KERNEL | GFP_DMA), &dma);
> +			udc->dd_cache, (GFP_ATOMIC | GFP_DMA), &dma);

doesn't apply:

checking file drivers/usb/gadget/udc/lpc32xx_udc.c
Hunk #1 FAILED at 938.

-- 
balbi

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