Merge pull request #690 from sjp38/sync2_fix_1

Sync2 fix 1

SyncPrim/linux-sync-2.md

@@ -10,9 +10,9 @@ We saw the [API](https://en.wikipedia.org/wiki/Application_programming_interface
 
 * `spin_lock_init` - produces initialization of the given `spinlock`;
 * `spin_lock` - acquires given `spinlock`;
-* `spin_lock_bh` - disables software [interrupts](https://en.wikipedia.org/wiki/Interrupt) and acquire given `spinlock`.
+* `spin_lock_bh` - disables software [interrupts](https://en.wikipedia.org/wiki/Interrupt) and acquire given `spinlock`;
 * `spin_lock_irqsave` and `spin_lock_irq` - disable interrupts on local processor and preserve/not preserve previous interrupt state in the `flags`;
-* `spin_unlock` - releases given `spinlock`;
+* `spin_unlock` - releases given `spinlock` and acquire given `spinlock`;
 * `spin_unlock_bh` - releases given `spinlock` and enables software interrupts;
 * `spin_is_locked` - returns the state of the given `spinlock`;
 * and etc.