From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 08E632C0120 for ; Wed, 8 May 2013 14:15:29 +1000 (EST) Received: from [127.0.0.1] (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.13.8) with ESMTP id r484FOIe013136 for ; Tue, 7 May 2013 23:15:26 -0500 Message-ID: <1367986524.25488.115.camel@pasglop> Subject: [PATCH] powerpc/powernv: Properly drop characters if console is closed From: Benjamin Herrenschmidt To: linuxppc-dev list Date: Wed, 08 May 2013 14:15:24 +1000 Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , If the firmware returns an error such as "closed" (or hardware error), we should drop characters. Currently we only do that when a firmware compatible with OPAL v2 APIs is detected, in the code that calls opal_console_write_buffer_space(), which didn't exist with OPAL v1 (or didn't work). However, when enabling early debug consoles, the flag indicating that v2 is supported isn't set yet, causing us, in case of errors or closed console, to spin forever. Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/powernv/opal.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index ade4463..12d9846 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -144,6 +144,13 @@ int opal_put_chars(uint32_t vtermno, const char *data, int total_len) rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) { len = total_len; rc = opal_console_write(vtermno, &len, data); + + /* Closed or other error drop */ + if (rc != OPAL_SUCCESS && rc != OPAL_BUSY && + rc != OPAL_BUSY_EVENT) { + written = total_len; + break; + } if (rc == OPAL_SUCCESS) { total_len -= len; data += len;