From nobody Sun Apr 12 00:31:18 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2B71C19F2B for ; Thu, 4 Aug 2022 07:58:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239327AbiHDH6n (ORCPT ); Thu, 4 Aug 2022 03:58:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231965AbiHDH6g (ORCPT ); Thu, 4 Aug 2022 03:58:36 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55F7D2A43B for ; Thu, 4 Aug 2022 00:58:35 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 1168D20C1D; Thu, 4 Aug 2022 07:58:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1659599914; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=49kxYTbGrjOgOVb5REr+889AVTZUvS522O21Up1xYtA=; b=c+UAGiIB3aCXunSF7Nt8pWeM+qG+If9rT0dkxaI4R6tFDXc0h6rVOUeuRMIJjGxfG/WY2Y MyO25GdAzugPZB2cjvkvpP9+3lAsPUovmKCTZmuOxFRkEKE8kfUOlNz78EMXyzu70puKxw y4Ylg/CtZVLjeCf0/ICdbFSHz4sd3vM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1659599914; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=49kxYTbGrjOgOVb5REr+889AVTZUvS522O21Up1xYtA=; b=lqUsrCubml93K3Us5q8XscJFujSz/3tJ6sNbz3sqEblyTc1+9KZN5gNqcZvPrObOKZlKHJ GXzuOeWU/r2DWqDA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id DC82A13AE1; Thu, 4 Aug 2022 07:58:33 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id +NIdNSl862IlJAAAMHmgww (envelope-from ); Thu, 04 Aug 2022 07:58:33 +0000 From: Takashi Iwai To: dri-devel@lists.freedesktop.org Cc: Dave Airlie , Sean Paul , Thomas Zimmermann , linux-kernel@vger.kernel.org Subject: [PATCH 2/4] drm/udl: Sync pending URBs at suspend / disconnect Date: Thu, 4 Aug 2022 09:58:24 +0200 Message-Id: <20220804075826.27036-3-tiwai@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220804075826.27036-1-tiwai@suse.de> References: <20220804075826.27036-1-tiwai@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" We need to wait for finishing to process the all URBs after disabling the pipe; otherwise pending URBs may stray at suspend/resume, leading to a possible memory corruption in a worst case. Tested-by: Thomas Zimmermann Signed-off-by: Takashi Iwai --- drivers/gpu/drm/udl/udl_drv.h | 1 + drivers/gpu/drm/udl/udl_main.c | 17 +++++++++++++++++ drivers/gpu/drm/udl/udl_modeset.c | 2 ++ 3 files changed, 20 insertions(+) diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h index e008686ec738..f01e50c5b7b7 100644 --- a/drivers/gpu/drm/udl/udl_drv.h +++ b/drivers/gpu/drm/udl/udl_drv.h @@ -83,6 +83,7 @@ static inline struct urb *udl_get_urb(struct drm_device *= dev) } =20 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len); +int udl_sync_pending_urbs(struct drm_device *dev); void udl_urb_completion(struct urb *urb); =20 int udl_init(struct udl_device *udl); diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c index 67fd41e59b80..93615648414b 100644 --- a/drivers/gpu/drm/udl/udl_main.c +++ b/drivers/gpu/drm/udl/udl_main.c @@ -270,6 +270,23 @@ int udl_submit_urb(struct drm_device *dev, struct urb = *urb, size_t len) return ret; } =20 +/* wait until all pending URBs have been processed */ +int udl_sync_pending_urbs(struct drm_device *dev) +{ + struct udl_device *udl =3D to_udl(dev); + int ret =3D 0; + + spin_lock_irq(&udl->urbs.lock); + /* 2 seconds as a sane timeout */ + if (!wait_event_lock_irq_timeout(udl->urbs.sleep, + udl->urbs.available =3D=3D udl->urbs.count, + udl->urbs.lock, + msecs_to_jiffies(2000))) + ret =3D -ETIMEDOUT; + spin_unlock_irq(&udl->urbs.lock); + return ret; +} + int udl_init(struct udl_device *udl) { struct drm_device *dev =3D &udl->drm; diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_mo= deset.c index e67c40a48fb4..50025606b6ad 100644 --- a/drivers/gpu/drm/udl/udl_modeset.c +++ b/drivers/gpu/drm/udl/udl_modeset.c @@ -408,6 +408,8 @@ udl_simple_display_pipe_disable(struct drm_simple_displ= ay_pipe *pipe) buf =3D udl_dummy_render(buf); =20 udl_submit_urb(dev, urb, buf - (char *)urb->transfer_buffer); + + udl_sync_pending_urbs(dev); } =20 static void --=20 2.35.3