From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932103Ab1G1Xod (ORCPT ); Thu, 28 Jul 2011 19:44:33 -0400 Received: from mga02.intel.com ([134.134.136.20]:12959 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756110Ab1G1XoS (ORCPT ); Thu, 28 Jul 2011 19:44:18 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,285,1309762800"; d="scan'208";a="33351999" From: Andi Kleen References: <20110728444.299940435@firstfloor.org> In-Reply-To: <20110728444.299940435@firstfloor.org> To: anton@samba.org, benh@kernel.crashing.org, ak@linux.intel.com, linux-kernel@vger.kernel.org, stable@kernel.org, tim.bird@am.sony.com Subject: [PATCH] [14/50] powerpc/pseries/hvconsole: Fix dropped console output Message-Id: <20110728234418.8B7182403FF@tassilo.jf.intel.com> Date: Thu, 28 Jul 2011 16:44:18 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.35-longterm review patch. If anyone has any objections, please let me know. ------------------ From: Anton Blanchard [ upstream commit 51d33021425e1f905beb4208823146f2fb6517da ] Return -EAGAIN when we get H_BUSY back from the hypervisor. This makes the hvc console driver retry, avoiding dropped printks. Signed-off-by: Anton Blanchard Cc: Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Andi Kleen Index: linux-2.6.35.y/arch/powerpc/platforms/pseries/hvconsole.c =================================================================== --- linux-2.6.35.y.orig/arch/powerpc/platforms/pseries/hvconsole.c +++ linux-2.6.35.y/arch/powerpc/platforms/pseries/hvconsole.c @@ -73,7 +73,7 @@ int hvc_put_chars(uint32_t vtermno, cons if (ret == H_SUCCESS) return count; if (ret == H_BUSY) - return 0; + return -EAGAIN; return -EIO; }