build/patch/kernel/meson64-next/0052-clk-rollback-set_rate_range-changes-on-failure.patch

From fe7933da09cfadd75af72256a1d11f41ea5e46f0 Mon Sep 17 00:00:00 2001
From: Jerome Brunet <jbrunet@baylibre.com>
Date: Mon, 20 Mar 2017 15:02:19 +0100
Subject: [PATCH 52/79] clk: rollback set_rate_range changes on failure

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/clk/clk.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d91236e..253f1d3 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1864,6 +1864,7 @@ int clk_set_rate_protect(struct clk *clk, unsigned long rate)
 int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max)
 {
 	int ret = 0;
+	unsigned int old_min, old_max;
 
 	if (!clk)
 		return 0;
@@ -1881,9 +1882,16 @@ int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max)
 		clk_core_rate_unprotect(clk->core);
 
 	if (min != clk->min_rate || max != clk->max_rate) {
+		old_min = clk->min_rate;
+		old_max = clk->max_rate;
 		clk->min_rate = min;
 		clk->max_rate = max;
 		ret = clk_core_set_rate_nolock(clk->core, clk->core->req_rate);
+		if (ret) {
+			/* undo changes */
+			clk->min_rate = old_min;
+			clk->max_rate = old_max;
+		}
 	}
 
 	if (clk->protect_count)
-- 
1.9.1