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

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Message-Id: <20190510124248.2430-1-alexandre.belloni@bootlin.com>
Date:   Fri, 10 May 2019 14:42:48 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Felipe Balbi <balbi@...nel.org>, 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: [PATCH] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC

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);
 	if (dd)
 		dd->this_dma = dma;
 
-- 
2.21.0