From patchwork Tue Feb 18 16:09:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 11388879 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 484FE138D for ; Tue, 18 Feb 2020 16:09:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 30ADF22B48 for ; Tue, 18 Feb 2020 16:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726463AbgBRQJ5 (ORCPT ); Tue, 18 Feb 2020 11:09:57 -0500 Received: from mga05.intel.com ([192.55.52.43]:65006 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726403AbgBRQJ5 (ORCPT ); Tue, 18 Feb 2020 11:09:57 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Feb 2020 08:09:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,456,1574150400"; d="scan'208";a="435893621" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga006.fm.intel.com with ESMTP; 18 Feb 2020 08:09:55 -0800 Received: by black.fi.intel.com (Postfix, from userid 1003) id 2EF3B109; Tue, 18 Feb 2020 18:09:55 +0200 (EET) From: Andy Shevchenko To: Greg Kroah-Hartman , linux-usb@vger.kernel.org Cc: Andy Shevchenko Subject: [PATCH v1] usb: core: Make use of acpi_evaluate_object() status Date: Tue, 18 Feb 2020 18:09:54 +0200 Message-Id: <20200218160954.42815-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.25.0 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Compiler is not happy about dangling variable: .../core/usb-acpi.c: In function ‘usb_acpi_get_connect_type’: .../core/usb-acpi.c:90:14: warning: variable ‘status’ set but not used [-Wunused-but-set-variable] 90 | acpi_status status; | ^~~~~~ Make use of it by checking the status and bail out in case of error. Signed-off-by: Andy Shevchenko --- drivers/usb/core/usb-acpi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c index f434a2060552..41b91f4c207d 100644 --- a/drivers/usb/core/usb-acpi.c +++ b/drivers/usb/core/usb-acpi.c @@ -86,7 +86,7 @@ static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle, { enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; - union acpi_object *upc; + union acpi_object *upc = NULL; acpi_status status; /* @@ -98,9 +98,11 @@ static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle, * no connectable, the port would be not used. */ status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer); + if (ACPI_FAILURE(status)) + goto out; + upc = buffer.pointer; - if (!upc || (upc->type != ACPI_TYPE_PACKAGE) - || upc->package.count != 4) { + if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4) { goto out; }