Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755232AbcCNSKR (ORCPT ); Mon, 14 Mar 2016 14:10:17 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:44147 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754077AbcCNRyV (ORCPT ); Mon, 14 Mar 2016 13:54:21 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Russell Currey , Michael Ellerman Subject: [PATCH 4.4 42/50] powerpc/powernv: Fix OPAL_CONSOLE_FLUSH prototype and usages Date: Mon, 14 Mar 2016 10:51:00 -0700 Message-Id: <20160314175019.322538593@linuxfoundation.org> X-Mailer: git-send-email 2.7.2 In-Reply-To: <20160314175013.403628835@linuxfoundation.org> References: <20160314175013.403628835@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2125 Lines: 62 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell Currey commit c88c5d43732a0356f99e5e4d1ad62ab1ea516b81 upstream. The recently added OPAL API call, OPAL_CONSOLE_FLUSH, originally took no parameters and returned nothing. The call was updated to accept the terminal number to flush, and returned various values depending on the state of the output buffer. The prototype has been updated and its usage in the OPAL kmsg dumper has been modified to support its new behaviour as an incremental flush. Signed-off-by: Russell Currey Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/include/asm/opal.h | 2 +- arch/powerpc/platforms/powernv/opal-kmsg.c | 9 ++++++++- 2 files changed, 9 insertions(+), 2 deletions(-) --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -35,7 +35,7 @@ int64_t opal_console_read(int64_t term_n uint8_t *buffer); int64_t opal_console_write_buffer_space(int64_t term_number, __be64 *length); -void opal_console_flush(void); +int64_t opal_console_flush(int64_t term_number); int64_t opal_rtc_read(__be32 *year_month_day, __be64 *hour_minute_second_millisecond); int64_t opal_rtc_write(uint32_t year_month_day, --- a/arch/powerpc/platforms/powernv/opal-kmsg.c +++ b/arch/powerpc/platforms/powernv/opal-kmsg.c @@ -27,6 +27,7 @@ static void force_opal_console_flush(str enum kmsg_dump_reason reason) { int i; + int64_t ret; /* * Outside of a panic context the pollers will continue to run, @@ -36,7 +37,13 @@ static void force_opal_console_flush(str return; if (opal_check_token(OPAL_CONSOLE_FLUSH)) { - opal_console_flush(); + ret = opal_console_flush(0); + + if (ret == OPAL_UNSUPPORTED || ret == OPAL_PARAMETER) + return; + + /* Incrementally flush until there's nothing left */ + while (opal_console_flush(0) != OPAL_SUCCESS); } else { /* * If OPAL_CONSOLE_FLUSH is not implemented in the firmware,