openwrt/target/linux/bcm53xx/patches-4.1/070-ARM-l2c-restore-the-behaviour-documented-above-l2c_e.patch

From d965b0fca7dcde3f82c982e0bf1631069fdeb8c9 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Fri, 15 May 2015 11:56:45 +0100
Subject: [PATCH 70/74] ARM: l2c: restore the behaviour documented above
 l2c_enable()

l2c_enable() is documented that it must not be called if the cache has
already been enabled.  Unfortunately, commit 6b49241ac252 ("ARM: 8259/1:
l2c: Refactor the driver to use commit-like interface") changed this
without updating the comment, for very little reason.  Revert this
change and restore the expected behaviour.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 arch/arm/mm/cache-l2x0.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -129,10 +129,6 @@ static void l2c_enable(void __iomem *bas
 {
 	unsigned long flags;
 
-	/* Do not touch the controller if already enabled. */
-	if (readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN)
-		return;
-
 	l2x0_saved_regs.aux_ctrl = aux;
 	l2c_configure(base);
 
@@ -163,7 +159,11 @@ static void l2c_save(void __iomem *base)
 
 static void l2c_resume(void)
 {
-	l2c_enable(l2x0_base, l2x0_saved_regs.aux_ctrl, l2x0_data->num_lock);
+	void __iomem *base = l2x0_base;
+
+	/* Do not touch the controller if already enabled. */
+	if (!(readl_relaxed(base + L2X0_CTRL) & L2X0_CTRL_EN))
+		l2c_enable(base, l2x0_saved_regs.aux_ctrl, l2x0_data->num_lock);
 }
 
 /*