sh: intc register modify fix

Make sure register modifications stay atomic. Fixes processors with
shared priority register masking. Dual bitmap masking is unaffected.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/irq/intc.c b/arch/sh/kernel/cpu/irq/intc.c
index e5a4912d665f..da5dae787888 100644
--- a/arch/sh/kernel/cpu/irq/intc.c
+++ b/arch/sh/kernel/cpu/irq/intc.c
@@ -101,17 +101,26 @@ static void write_32(unsigned long addr, unsigned long h, unsigned long data)
 
 static void modify_8(unsigned long addr, unsigned long h, unsigned long data)
 {
+        unsigned long flags;
+        local_irq_save(flags);
         ctrl_outb(set_field(ctrl_inb(addr), data, h), addr);
+        local_irq_restore(flags);
 }
 
 static void modify_16(unsigned long addr, unsigned long h, unsigned long data)
 {
+        unsigned long flags;
+        local_irq_save(flags);
         ctrl_outw(set_field(ctrl_inw(addr), data, h), addr);
+        local_irq_restore(flags);
 }
 
 static void modify_32(unsigned long addr, unsigned long h, unsigned long data)
 {
+        unsigned long flags;
+        local_irq_save(flags);
         ctrl_outl(set_field(ctrl_inl(addr), data, h), addr);
+        local_irq_restore(flags);
 }
 
 enum {  REG_FN_ERR = 0, REG_FN_WRITE_BASE = 1, REG_FN_MODIFY_BASE = 5 };