libata: no need to speed down if already at PIO0

[pandora-kernel.git] / lib / kernel_lock.c

diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
index cb5490e..f73e2f8 100644 (file)
--- a/lib/kernel_lock.c
+++ b/lib/kernel_lock.c
@@ -2,7 +2,7 @@
  * lib/kernel_lock.c
  *
  * This is the traditional BKL - big kernel lock. Largely
- * relegated to obsolescense, but used by various less
+ * relegated to obsolescence, but used by various less
  * important (or lazy) subsystems.
  */
 #include <linux/smp_lock.h>
@@ -14,7 +14,7 @@
  * The 'big kernel semaphore'
  *
  * This mutex is taken and released recursively by lock_kernel()
- * and unlock_kernel().  It is transparently dropped and reaquired
+ * and unlock_kernel().  It is transparently dropped and reacquired
  * over schedule().  It is used to protect legacy code that hasn't
  * been migrated to a proper locking design yet.
  *
@@ -92,7 +92,7 @@ void __lockfunc unlock_kernel(void)
  * The 'big kernel lock'
  *
  * This spinlock is taken and released recursively by lock_kernel()
- * and unlock_kernel().  It is transparently dropped and reaquired
+ * and unlock_kernel().  It is transparently dropped and reacquired
  * over schedule().  It is used to protect legacy code that hasn't
  * been migrated to a proper locking design yet.
  *
@@ -177,7 +177,12 @@ static inline void __lock_kernel(void)
 
 static inline void __unlock_kernel(void)
 {
-       spin_unlock(&kernel_flag);
+       /*
+        * the BKL is not covered by lockdep, so we open-code the
+        * unlocking sequence (and thus avoid the dep-chain ops):
+        */
+       _raw_spin_unlock(&kernel_flag);
+       preempt_enable();
 }
 
 /*