linux-kernel - [PATCH 3.12 27/27] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20140123190651.584568157@linuxfoundation.org>
Date:	Thu, 23 Jan 2014 11:07:04 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Rob Herring <rob.herring@...xeda.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Tony Lindgren <tony@...mide.com>,
	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 3.12 27/27] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

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

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

From: Taras Kondratiuk <taras.kondratiuk@...aro.org>

commit b25f3e1c358434bf850220e04f28eebfc45eb634 upstream.

Kexec disables outer cache before jumping to reboot code, but it doesn't
flush it explicitly. Flush is done implicitly inside of l2x0_disable().
But some SoC's override default .disable handler and don't flush cache.
This may lead to a corrupted memory during Kexec reboot on these
platforms.

This patch adds cache flush inside of OMAP4 and Highbank outer_cache.disable()
handlers to make it consistent with default l2x0_disable().

Acked-by: Rob Herring <rob.herring@...xeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-highbank/highbank.c  |    1 +
 arch/arm/mach-omap2/omap4-common.c |    1 +
 2 files changed, 2 insertions(+)

--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -66,6 +66,7 @@ void highbank_set_cpu_jump(int cpu, void
 
 static void highbank_l2x0_disable(void)
 {
+	outer_flush_all();
 	/* Disable PL310 L2 Cache controller */
 	highbank_smc1(0x102, 0x0);
 }
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -163,6 +163,7 @@ void __iomem *omap4_get_l2cache_base(voi
 
 static void omap4_l2x0_disable(void)
 {
+	outer_flush_all();
 	/* Disable PL310 L2 Cache controller */
 	omap_smc1(0x102, 0x0);
 }


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/