SPARC64 NS87303: Replace cli/sti with spinlocking.

arch/sparc64/kernel/devices.c

@@ -10,6 +10,7 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/string.h>
+#include <linux/spinlock.h>
 
 #include <asm/page.h>
 #include <asm/oplib.h>
@@ -17,6 +18,11 @@
 #include <asm/smp.h>
 #include <asm/spitfire.h>
 
+/* Used to synchronize acceses to NatSemi SUPER I/O chip configure
+ * operations in asm/ns87303.h
+ */
+spinlock_t ns87303_lock = SPIN_LOCK_UNLOCKED;
+
 struct prom_cpuinfo linux_cpus[NR_CPUS] __initdata = { { 0 } };
 unsigned prom_cpu_nodes[NR_CPUS];
 int linux_num_cpus = 0;

arch/sparc64/kernel/sparc64_ksyms.c

@@ -52,6 +52,7 @@
 #include <asm/isa.h>
 #endif
 #include <asm/a.out.h>
+#include <asm/ns87303.h>
 
 struct poll {
 	int fd;
@@ -373,3 +374,6 @@ EXPORT_SYMBOL(kbd_pt_regs);
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 EXPORT_SYMBOL(do_BUG);
 #endif
+
+/* for ns8703 */
+EXPORT_SYMBOL(ns87303_lock);

include/asm-sparc64/ns87303.h

@@ -78,9 +78,13 @@
 
 #ifdef __KERNEL__
 
+#include <linux/spinlock.h>
+
 #include <asm/system.h>
 #include <asm/io.h>
 
+extern spinlock_t ns87303_lock;
+
 static __inline__ int ns87303_modify(unsigned long port, unsigned int index,
 				     unsigned char clr, unsigned char set)
 {
@@ -96,14 +100,16 @@ static __inline__ int ns87303_modify(unsigned long port, unsigned int index,
 	if (index > 0x0d)
 		return -EINVAL;
 
-	save_flags(flags); cli();
+	spin_lock_irqsave(&ns87303_lock, flags);
+
 	outb(index, port);
 	value = inb(port + 1);
 	value &= ~(reserved[index] | clr);
 	value |= set;
 	outb(value, port + 1);
 	outb(value, port + 1);
-	restore_flags(flags);
+
+	spin_unlock_irqrestore(&ns87303_lock, flags);
 
 	return 0;
 }