From owner-svn-src-head@freebsd.org Tue Jun 26 16:00:17 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B02FF1000363; Tue, 26 Jun 2018 16:00:17 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 61231766F5; Tue, 26 Jun 2018 16:00:17 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3D97B165EF; Tue, 26 Jun 2018 16:00:17 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w5QG0Hu6002004; Tue, 26 Jun 2018 16:00:17 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w5QG0Him002003; Tue, 26 Jun 2018 16:00:17 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201806261600.w5QG0Him002003@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Tue, 26 Jun 2018 16:00:17 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r335669 - head/lib/libusb X-SVN-Group: head X-SVN-Commit-Author: hselasky X-SVN-Commit-Paths: head/lib/libusb X-SVN-Commit-Revision: 335669 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Jun 2018 16:00:17 -0000 Author: hselasky Date: Tue Jun 26 16:00:16 2018 New Revision: 335669 URL: https://svnweb.freebsd.org/changeset/base/335669 Log: Improve the userspace USB string reading function in LibUSB. Some USB devices does not allow a partial descriptor readout. Found by: bz @ MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/lib/libusb/libusb20.c Modified: head/lib/libusb/libusb20.c ============================================================================== --- head/lib/libusb/libusb20.c Tue Jun 26 15:00:54 2018 (r335668) +++ head/lib/libusb/libusb20.c Tue Jun 26 16:00:16 2018 (r335669) @@ -814,6 +814,7 @@ libusb20_dev_req_string_sync(struct libusb20_device *p { struct LIBUSB20_CONTROL_SETUP_DECODED req; int error; + int flags; /* make sure memory is initialised */ memset(ptr, 0, len); @@ -840,22 +841,24 @@ libusb20_dev_req_string_sync(struct libusb20_device *p error = libusb20_dev_request_sync(pdev, &req, ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK); if (error) { - return (error); + /* try to request full string */ + req.wLength = 255; + flags = 0; + } else { + /* extract length and request full string */ + req.wLength = *(uint8_t *)ptr; + flags = LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK; } - req.wLength = *(uint8_t *)ptr; /* bytes */ if (req.wLength > len) { /* partial string read */ req.wLength = len; } - error = libusb20_dev_request_sync(pdev, &req, - ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK); - - if (error) { + error = libusb20_dev_request_sync(pdev, &req, ptr, NULL, 1000, flags); + if (error) return (error); - } - if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) { + + if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) return (LIBUSB20_ERROR_OTHER); - } return (0); /* success */ }