From patchwork Tue May 24 22:53:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Wu X-Patchwork-Id: 9134535 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 A8E78607D3 for ; Wed, 25 May 2016 00:56:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9C6A728176 for ; Wed, 25 May 2016 00:56:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 915AB28221; Wed, 25 May 2016 00:56:24 +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=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 35F6528176 for ; Wed, 25 May 2016 00:56:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 89FE86E856; Wed, 25 May 2016 00:56:10 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.lekensteyn.nl (mail.lekensteyn.nl [IPv6:2a02:2308::360:1:25]) by gabe.freedesktop.org (Postfix) with ESMTPS id EB5216E30B; Tue, 24 May 2016 22:53:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lekensteyn.nl; s=s2048-2015-q1; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=TJDQ/yv/Fmhh6P5+o9z7Z6fim3OlXttzndgLr8MmucY=; b=ZRK5KItqo7SiOhsoQpBU/Ge+oo/VUFTmRKdE174+q9RhXXA2P3tWZ3YR4xBm/1t4OTdSQxzRzKjYKHTHJU+oCiaJCranF5NeHHoNPFobT0ytg1DehlMLMMdjYxv2KLntqsPkfxXdkz7cAucOIEcm9Q9QWW27uq3HEDLCe98+fhZGaq5U0poITq7igupLiA7uz88qPZS1ARmwpsGOhDb1h1ulqdN33AUXybH1qra28Mm1BtkIyUf6UP08gCCRJMiLdm0dSdC4denaW1fCAUeaUg0HqGsTAAk+rNjxqVAreMGJfS53Rwo8JZkTOHuFoM9ukZHZYo+Jaqzrgu0ttMqbIQ==; Received: by lekensteyn.nl with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1b5LCr-0008Q6-0p; Wed, 25 May 2016 00:53:45 +0200 From: Peter Wu To: nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 3/4] drm/nouveau/acpi: check for function 0x1B before using it Date: Wed, 25 May 2016 00:53:00 +0200 Message-Id: <1464130381-4797-4-git-send-email-peter@lekensteyn.nl> X-Mailer: git-send-email 2.8.2 In-Reply-To: <1464130381-4797-1-git-send-email-peter@lekensteyn.nl> References: <1464130381-4797-1-git-send-email-peter@lekensteyn.nl> X-Mailman-Approved-At: Wed, 25 May 2016 00:56:08 +0000 Cc: Dave Airlie X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP Do not unconditionally invoke function 0x1B without checking for its availability, it leads to an infinite loop on some firmware. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104791 Fixes: 5addcf0a5f0fad ("nouveau: add runtime PM support (v0.9)") Signed-off-by: Peter Wu --- drivers/gpu/drm/nouveau/nouveau_acpi.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c index 71d5e6a..df9f73e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c @@ -45,6 +45,7 @@ static struct nouveau_dsm_priv { bool dsm_detected; bool optimus_detected; + bool optimus_flags_detected; acpi_handle dhandle; acpi_handle rom_handle; } nouveau_dsm_priv; @@ -212,7 +213,7 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = { }; static void nouveau_dsm_pci_probe(struct pci_dev *pdev, bool *has_mux, - bool *has_opt) + bool *has_opt, bool *has_opt_flags) { acpi_handle dhandle; bool supports_mux; @@ -236,6 +237,7 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, bool *has_mux, nouveau_dsm_priv.dhandle = dhandle; *has_mux = supports_mux; *has_opt = !!optimus_funcs; + *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); if (optimus_funcs) { uint32_t result; @@ -255,6 +257,7 @@ static bool nouveau_dsm_detect(void) struct pci_dev *pdev = NULL; bool has_mux = false; bool has_optimus = false; + bool has_optimus_flags = false; int vga_count = 0; bool guid_valid; bool ret = false; @@ -269,13 +272,15 @@ static bool nouveau_dsm_detect(void) while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { vga_count++; - nouveau_dsm_pci_probe(pdev, &has_mux, &has_optimus); + nouveau_dsm_pci_probe(pdev, &has_mux, &has_optimus, + &has_optimus_flags); } while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { vga_count++; - nouveau_dsm_pci_probe(pdev, &has_mux, &has_optimus); + nouveau_dsm_pci_probe(pdev, &has_mux, &has_optimus, + &has_optimus_flags); } /* find the optimus DSM or the old v1 DSM */ @@ -285,6 +290,7 @@ static bool nouveau_dsm_detect(void) printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n", acpi_method_name); nouveau_dsm_priv.optimus_detected = true; + nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; ret = true; } else if (vga_count == 2 && has_mux && guid_valid) { acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, @@ -317,8 +323,9 @@ void nouveau_switcheroo_optimus_dsm(void) if (!nouveau_dsm_priv.optimus_detected) return; - nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, - 0x3, &result); + if (nouveau_dsm_priv.optimus_flags_detected) + nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, + 0x3, &result); nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);