Since mandatory barriers may be used (explicitly or implicitly via readl
etc.) to ensure the ordering between Device and Normal memory accesses,
a DMB is not enough. This patch converts it to a DSB.
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
---
arch/arm/include/asm/system.h | 2 +-
arch/arm/mach-realview/include/mach/barriers.h | 2 +-
arch/arm/mach-tegra/include/mach/barriers.h | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 9a87823..926d867 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -159,7 +159,7 @@ extern unsigned int user_debug;
#include <mach/barriers.h>
#elif defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP)
#define mb() do { dsb(); outer_sync(); } while (0)
-#define rmb() dmb()
+#define rmb() dsb()
#define wmb() mb()
#else
#include <asm/memory.h>
diff --git a/arch/arm/mach-realview/include/mach/barriers.h b/arch/arm/mach-realview/include/mach/barriers.h
index 0c5d749..9a73219 100644
--- a/arch/arm/mach-realview/include/mach/barriers.h
+++ b/arch/arm/mach-realview/include/mach/barriers.h
@@ -4,5 +4,5 @@
* operation to deadlock the system.
*/
#define mb() dsb()
-#define rmb() dmb()
+#define rmb() dsb()
#define wmb() mb()
diff --git a/arch/arm/mach-tegra/include/mach/barriers.h b/arch/arm/mach-tegra/include/mach/barriers.h
index cc11517..425b42e 100644
--- a/arch/arm/mach-tegra/include/mach/barriers.h
+++ b/arch/arm/mach-tegra/include/mach/barriers.h
@@ -23,7 +23,7 @@
#include <asm/outercache.h>
-#define rmb() dmb()
+#define rmb() dsb()
#define wmb() do { dsb(); outer_sync(); } while (0)
#define mb() wmb()
--
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