---- a/arch/mips/ath79/common.c
-+++ b/arch/mips/ath79/common.c
-@@ -22,6 +22,7 @@
- #include "common.h"
-
- static DEFINE_SPINLOCK(ath79_device_reset_lock);
-+static DEFINE_MUTEX(ath79_flash_mutex);
-
- u32 ath79_cpu_freq;
- EXPORT_SYMBOL_GPL(ath79_cpu_freq);
-@@ -142,3 +143,16 @@ void ath79_device_reset_clear(u32 mask)
- spin_unlock_irqrestore(&ath79_device_reset_lock, flags);
- }
- EXPORT_SYMBOL_GPL(ath79_device_reset_clear);
-+
-+void ath79_flash_acquire(void)
-+{
-+ mutex_lock(&ath79_flash_mutex);
-+}
-+EXPORT_SYMBOL_GPL(ath79_flash_acquire);
-+
-+void ath79_flash_release(void)
-+{
-+ mutex_unlock(&ath79_flash_mutex);
-+}
-+EXPORT_SYMBOL_GPL(ath79_flash_release);
-+
---- a/arch/mips/include/asm/mach-ath79/ath79.h
-+++ b/arch/mips/include/asm/mach-ath79/ath79.h
-@@ -145,4 +145,7 @@ static inline u32 ath79_reset_rr(unsigne
- void ath79_device_reset_set(u32 mask);
- void ath79_device_reset_clear(u32 mask);
-
-+void ath79_flash_acquire(void);
-+void ath79_flash_release(void);
-+
- #endif /* __ASM_MACH_ATH79_H */