[PATCH] smc91x: fix SMP lock usage

From: Nicolas Pitre <nico@cam.org>

Well, there is no such thing as a spin_trylock_irq() in the kernel.
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

drivers/net/smc91x.c

@@ -563,7 +563,15 @@ static inline void  smc_rcv(struct net_device *dev)
  * any other concurrent access and C would always interrupt B. But life
  * isn't that easy in a SMP world...
  */
-#define smc_special_trylock(lock)	spin_trylock_irq(lock)
+#define smc_special_trylock(lock)					\
+({									\
+	int __ret;							\
+	local_irq_disable();						\
+	__ret = spin_trylock(lock);					\
+	if (!__ret)							\
+		local_irq_enable();					\
+	__ret;								\
+})
 #define smc_special_lock(lock)		spin_lock_irq(lock)
 #define smc_special_unlock(lock)	spin_unlock_irq(lock)
 #else