From patchwork Sun Jun 3 14:41:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 10445389 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7424D6022E for ; Sun, 3 Jun 2018 15:19:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 62856289ED for ; Sun, 3 Jun 2018 15:19:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5762828ACB; Sun, 3 Jun 2018 15:19:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 03442289ED for ; Sun, 3 Jun 2018 15:19:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751638AbeFCPT0 (ORCPT ); Sun, 3 Jun 2018 11:19:26 -0400 Received: from 109-183-129-149.tmcz.cz ([109.183.129.149]:59040 "EHLO leontynka.twibright.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751625AbeFCPT0 (ORCPT ); Sun, 3 Jun 2018 11:19:26 -0400 Received: from root by leontynka.twibright.com with local (Exim 4.89) (envelope-from ) id 1fPUDB-0003vf-02; Sun, 03 Jun 2018 16:42:25 +0200 Message-Id: <20180603144224.714382188@twibright.com> User-Agent: quilt/0.63-1 Date: Sun, 03 Jun 2018 16:41:09 +0200 From: Mikulas Patocka To: Mikulas Patocka , Bartlomiej Zolnierkiewicz , Dave Airlie , Bernie Thompson , Ladislav Michl Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Subject: [PATCH 16/21] udlfb: handle allocation failure References: <20180603144053.875668929@twibright.com> MIME-Version: 1.0 Content-Disposition: inline; filename=udl-allocation-failure.patch Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Allocations larger than PAGE_ALLOC_COSTLY_ORDER are unreliable and they may fail anytime. This patch fixes the udlfb driver so that when a large alloactions fails, it tries to do multiple smaller allocations. Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org --- drivers/video/fbdev/udlfb.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-4.17-rc7/drivers/video/fbdev/udlfb.c =================================================================== --- linux-4.17-rc7.orig/drivers/video/fbdev/udlfb.c 2018-06-03 13:17:38.000000000 +0200 +++ linux-4.17-rc7/drivers/video/fbdev/udlfb.c 2018-06-03 13:17:38.000000000 +0200 @@ -1843,17 +1843,22 @@ static void dlfb_free_urb_list(struct dl static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) { - int i = 0; struct urb *urb; struct urb_node *unode; char *buf; + size_t wanted_size = count * size; spin_lock_init(&dlfb->urbs.lock); +retry: dlfb->urbs.size = size; INIT_LIST_HEAD(&dlfb->urbs.list); - while (i < count) { + sema_init(&dlfb->urbs.limit_sem, 0); + dlfb->urbs.count = 0; + dlfb->urbs.available = 0; + + while (dlfb->urbs.count * size < wanted_size) { unode = kzalloc(sizeof(*unode), GFP_KERNEL); if (!unode) break; @@ -1866,11 +1871,16 @@ static int dlfb_alloc_urb_list(struct dl } unode->urb = urb; - buf = usb_alloc_coherent(dlfb->udev, MAX_TRANSFER, GFP_KERNEL, + buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, &urb->transfer_dma); if (!buf) { kfree(unode); usb_free_urb(urb); + if (size > PAGE_SIZE) { + size /= 2; + dlfb_free_urb_list(dlfb); + goto retry; + } break; } @@ -1881,14 +1891,12 @@ static int dlfb_alloc_urb_list(struct dl list_add_tail(&unode->entry, &dlfb->urbs.list); - i++; + up(&dlfb->urbs.limit_sem); + dlfb->urbs.count++; + dlfb->urbs.available++; } - sema_init(&dlfb->urbs.limit_sem, i); - dlfb->urbs.count = i; - dlfb->urbs.available = i; - - return i; + return dlfb->urbs.count; } static struct urb *dlfb_get_urb(struct dlfb_data *dlfb)