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-rw-r--r--drivers/serial/8250.c17
-rw-r--r--include/linux/spinlock.h8
-rw-r--r--kernel/spinlock.c8
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;
}