linux-kernel - [PATCH v3] ARM: cache-l2x0.c: save aux ctrl for resume in case that l2x0 is enabled before init

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>] [day] [month] [year] [list]

Message-Id: <1335416937-24724-1-git-send-email-ylmao@marvell.com>
Date:	Thu, 26 Apr 2012 13:08:57 +0800
From:	Yilu Mao <ylmao@...vell.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux@....linux.org.uk, Baohua.Song@....com,
	santosh.shilimkar@...com, robherring2@...il.com,
	catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
	Yilu Mao <ylmao@...vell.com>
Subject: [PATCH v3] ARM: cache-l2x0.c: save aux ctrl for resume in case that l2x0 is enabled before init

If l2x0 controller has been enabled when calling l2x0_init, the aux ctrl
register will not be saved in l2x0_saved_regs. Therefore we can not use
l2x0_saved_regs.aux_ctrl for resume later. This patch fixed the problem
by saving aux ctrl in l2x0_saved_regs just after it's being read from
the register.

Signed-off-by: Yilu Mao <ylmao@...vell.com>
---
 arch/arm/mm/cache-l2x0.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index a53fd2a..f273c7e 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -320,6 +320,13 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
 	cache_id = readl_relaxed(l2x0_base + L2X0_CACHE_ID);
 	aux = readl_relaxed(l2x0_base + L2X0_AUX_CTRL);
 
+	/*
+	 * In case l2x controller is enabled, the aux ctrl register
+	 * can't be set. So the original value should be stored in
+	 * the l2x0_saved_regs for restoring when resume.
+	 */
+	l2x0_saved_regs.aux_ctrl = aux;
+
 	aux &= aux_mask;
 	aux |= aux_val;
 
-- 
1.7.5.4

--
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/