linux-kernel - [PATCH 4.14 070/496] ARM: OMAP2+: Fix sar

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Message-Id: <20180528100322.736842640@linuxfoundation.org>
Date:   Mon, 28 May 2018 11:57:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Andrew F. Davis" <afd@...com>,
        Dave Gerlach <d-gerlach@...com>, Keerthy <j-keerthy@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Tero Kristo <t-kristo@...com>,
        Tony Lindgren <tony@...mide.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 070/496] ARM: OMAP2+: Fix sar_base inititalization for HS omaps

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit fe27f16794f313f5fc16f6d2f42d8c2b2f4d70cc ]

HS omaps use irq_save_secure_context() instead of irq_save_context()
so sar_base will never get initialized and irq_sar_clear() gets called
with a wrong address for HS omaps from irq_restore_context().

Starting with commit f4b9f40ae95b ("ARM: OMAP4+: Initialize SAR RAM
base early for proper CPU1 reset for kexec") we have it available,
and this ideally would been fixed with that commit already.

Fixes: f4b9f40ae95b ("ARM: OMAP4+: Initialize SAR RAM base early for
proper CPU1 reset for kexec")
Cc: Andrew F. Davis <afd@...com>
Cc: Dave Gerlach <d-gerlach@...com>
Cc: Keerthy <j-keerthy@...com>
Cc: Santosh Shilimkar <ssantosh@...nel.org>
Cc: Tero Kristo <t-kristo@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/mach-omap2/omap-wakeupgen.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/mach-omap2/omap-wakeupgen.c
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -299,8 +299,6 @@ static void irq_save_context(void)
 	if (soc_is_dra7xx())
 		return;
 
-	if (!sar_base)
-		sar_base = omap4_get_sar_ram_base();
 	if (wakeupgen_ops && wakeupgen_ops->save_context)
 		wakeupgen_ops->save_context();
 }
@@ -598,6 +596,8 @@ static int __init wakeupgen_init(struct
 	irq_hotplug_init();
 	irq_pm_init();
 
+	sar_base = omap4_get_sar_ram_base();
+
 	return 0;
 }
 IRQCHIP_DECLARE(ti_wakeupgen, "ti,omap4-wugen-mpu", wakeupgen_init);