Patch "powerpc/powernv: Fix OPAL_CONSOLE_FLUSH prototype and usages" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

powerpc/powernv: Fix OPAL_CONSOLE_FLUSH prototype and usages

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-powernv-fix-opal_console_flush-prototype-and-usages.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Russell Currey <[email protected]>
Date: Wed, 13 Jan 2016 12:04:32 +1100
Subject: powerpc/powernv: Fix OPAL_CONSOLE_FLUSH prototype and usages

From: Russell Currey <[email protected]>

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.

---
 arch/powerpc/include/asm/opal.h            |    2 +-
 arch/powerpc/platforms/powernv/opal-kmsg.c |    9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

@@ -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,

@@ -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,

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/powerpc-powernv-add-a-kmsg_dumper-that-flushes-console-output-on-panic.patch queue-4.4/powerpc-powernv-fix-opal_console_flush-prototype-and-usages.patch