From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E3C7C282CE for ; Wed, 22 May 2019 12:07:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 50663217D4 for ; Wed, 22 May 2019 12:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729293AbfEVMHu (ORCPT ); Wed, 22 May 2019 08:07:50 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:37195 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728584AbfEVMHu (ORCPT ); Wed, 22 May 2019 08:07:50 -0400 X-Originating-IP: 92.137.69.152 Received: from localhost (alyon-656-1-672-152.w92-137.abo.wanadoo.fr [92.137.69.152]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 31F87E000A; Wed, 22 May 2019 12:07:45 +0000 (UTC) From: Alexandre Belloni To: Felipe Balbi , Vladimir Zapolskiy , Greg Kroah-Hartman Cc: Sylvain Lemieux , linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni , James Grant Subject: [PATCH v2] usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC Date: Wed, 22 May 2019 14:07:36 +0200 Message-Id: <20190522120736.5521-1-alexandre.belloni@bootlin.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Also remove the unnecessary cast. Tested-by: James Grant Signed-off-by: Alexandre Belloni --- Changes in v2: - remove unnecessary cast as pointed by Joe Perches - Collected tested-by drivers/usb/gadget/udc/lpc32xx_udc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/usb/gadget/udc/lpc32xx_udc.c b/drivers/usb/gadget/udc/lpc32xx_udc.c index d8f1c60793ed..2719194ebf42 100644 --- a/drivers/usb/gadget/udc/lpc32xx_udc.c +++ b/drivers/usb/gadget/udc/lpc32xx_udc.c @@ -937,8 +937,7 @@ static struct lpc32xx_usbd_dd_gad *udc_dd_alloc(struct lpc32xx_udc *udc) dma_addr_t dma; struct lpc32xx_usbd_dd_gad *dd; - dd = (struct lpc32xx_usbd_dd_gad *) dma_pool_alloc( - udc->dd_cache, (GFP_KERNEL | GFP_DMA), &dma); + dd = dma_pool_alloc(udc->dd_cache, GFP_ATOMIC | GFP_DMA, &dma); if (dd) dd->this_dma = dma; -- 2.21.0