3 files changed, 20 insertions, 13 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 3bbf0cc6e53f..30e8beb71430 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -682,8 +682,6 @@ static void autoconfig_16550a(struct uart_8250_port *up)
          * from EXCR1. Switch back to bank 0, change it in MCR. Then
          * switch back to bank 2, read it from EXCR1 again and check
          * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
-         * On PowerPC we don't want to change baud_base, as we have
-         * a number of different divisors.  -- Tom Rini
          */
         serial_outp(up, UART_LCR, 0);
         status1 = serial_in(up, UART_MCR);
@@ -699,16 +697,25 @@ static void autoconfig_16550a(struct uart_8250_port *up)
                 serial_outp(up, UART_MCR, status1);
 
                 if ((status2 ^ status1) & UART_MCR_LOOP) {
-#ifndef CONFIG_PPC
+                        unsigned short quot;
+
                         serial_outp(up, UART_LCR, 0xE0);
+
+                        quot = serial_inp(up, UART_DLM) << 8;
+                        quot += serial_inp(up, UART_DLL);
+                        quot <<= 3;
+
                         status1 = serial_in(up, 0x04); /* EXCR1 */
                         status1 &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
                         status1 |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
                         serial_outp(up, 0x04, status1);
+                        
+                        serial_outp(up, UART_DLL, quot & 0xff);
+                        serial_outp(up, UART_DLM, quot >> 8);
+
                         serial_outp(up, UART_LCR, 0);
-                        up->port.uartclk = 921600*16;
-#endif
 
+                        up->port.uartclk = 921600*16;
                         up->port.type = PORT_NS16550A;
                         up->capabilities |= UART_NATSEMI;
                         return;
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index e895f3eaf53a..d6ba068719b6 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -248,7 +248,7 @@ typedef struct {
 
 #define _spin_trylock_bh(lock)  ({preempt_disable(); local_bh_disable(); \
                                 _raw_spin_trylock(lock) ? \
-                                1 : ({preempt_enable(); local_bh_enable(); 0;});})
+                                1 : ({preempt_enable_no_resched(); local_bh_enable(); 0;});})
 
 #define _spin_lock(lock)        \
 do { \
@@ -383,7 +383,7 @@ do { \
 #define _spin_unlock_bh(lock) \
 do { \
         _raw_spin_unlock(lock); \
-        preempt_enable(); \
+        preempt_enable_no_resched(); \
         local_bh_enable(); \
         __release(lock); \
 } while (0)
@@ -391,7 +391,7 @@ do { \
 #define _write_unlock_bh(lock) \
 do { \
         _raw_write_unlock(lock); \
-        preempt_enable(); \
+        preempt_enable_no_resched(); \
         local_bh_enable(); \
         __release(lock); \
 } while (0)
@@ -423,8 +423,8 @@ do { \
 #define _read_unlock_bh(lock)   \
 do { \
         _raw_read_unlock(lock); \
+        preempt_enable_no_resched();    \
         local_bh_enable();      \
-        preempt_enable();       \
         __release(lock); \
 } while (0)
 
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index e15ed17863f1..0c3f9d8bbe17 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -294,7 +294,7 @@ EXPORT_SYMBOL(_spin_unlock_irq);
 void __lockfunc _spin_unlock_bh(spinlock_t *lock)
 {
         _raw_spin_unlock(lock);
-        preempt_enable();
+        preempt_enable_no_resched();
         local_bh_enable();
 }
 EXPORT_SYMBOL(_spin_unlock_bh);
@@ -318,7 +318,7 @@ EXPORT_SYMBOL(_read_unlock_irq);
 void __lockfunc _read_unlock_bh(rwlock_t *lock)
 {
         _raw_read_unlock(lock);
-        preempt_enable();
+        preempt_enable_no_resched();
         local_bh_enable();
 }
 EXPORT_SYMBOL(_read_unlock_bh);
@@ -342,7 +342,7 @@ EXPORT_SYMBOL(_write_unlock_irq);
 void __lockfunc _write_unlock_bh(rwlock_t *lock)
 {
         _raw_write_unlock(lock);
-        preempt_enable();
+        preempt_enable_no_resched();
         local_bh_enable();
 }
 EXPORT_SYMBOL(_write_unlock_bh);
@@ -354,7 +354,7 @@ int __lockfunc _spin_trylock_bh(spinlock_t *lock)
         if (_raw_spin_trylock(lock))
                 return 1;
 
-        preempt_enable();
+        preempt_enable_no_resched();
         local_bh_enable();
         return 0;
 }