OMAP2+: clockdomain: Add per clkdm lock to prevent concurrent state programming

Since the clkdm state programming is now done from within the hwmod
framework (which uses a per-hwmod lock) instead of the being done
from the clock framework (which used a global lock), there is now a
need to have per-clkdm locking to prevent races between different
hwmods/modules belonging to the same clock domain concurrently
programming the clkdm state.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clockdomain.h b/arch/arm/mach-omap2/clockdomain.h
index 8782a5cadfa6..1e50c88b8a07 100644
--- a/arch/arm/mach-omap2/clockdomain.h
+++ b/arch/arm/mach-omap2/clockdomain.h
@@ -17,6 +17,7 @@
 #define __ARCH_ARM_MACH_OMAP2_CLOCKDOMAIN_H
 
 #include <linux/init.h>
+#include <linux/spinlock.h>
 
 #include "powerdomain.h"
 #include <plat/clock.h>
@@ -128,6 +129,7 @@ struct clockdomain {
         const struct omap_chip_id omap_chip;
         atomic_t usecount;
         struct list_head node;
+        spinlock_t lock;
 };
 
 /**