From 1de1455f33709a8afd8d41d26d09739a1148105b Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Wed, 8 May 2013 14:14:26 +1000 Subject: [PATCH] powerpc/powernv: Properly drop characters if console is closed 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 ade4463226c6..12d9846aa87e 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; -- 2.20.1